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Curriculum Vitae
Dr. Diana Shvydka Dept. of Radiation Oncology, University of Toledo Health Science Campus,
3000 Arlington Ave., Toledo OH 43614 phone: (419) 787-4712 (cell), (419)-383-5328 (work)
e-mail: [email protected]
RESEARCH INTERESTS
General Interests: Medical Physics, Device Physics
Specific interests: Thin-film radiation detectors; Materials and device characterization,
fabrication, and simulation; Radiation transport Monte Carlo
modeling; Comsol modeling
EMPLOYMENT RECORD
2009 – present Assistant Professor, Department of Radiation Oncology, University of
Toledo Health Science Campus, Toledo OH;
2006 – 2009 Postdoctoral Research Associate, Department of Radiation Oncology,
University of Toledo Health Science Campus, Toledo OH;
2004 – 2006 Research Assistant Professor, Department of Physics and Astronomy
University of Toledo, Toledo OH;
2002 – 2004 Postdoctoral Research Associate, Department of Physics and Astronomy
University of Toledo, Toledo OH;
1999 – 2002 Intern at First Solar, LLC, Perrysburg OH;
1996 – 2002 Ph.D. Graduate Student, Department of Physics and Astronomy
University of Toledo, Toledo OH;
1996 – 1997 Software Engineer, Toledo Transducers, Inc., Holland OH;
1992 – 1995 Research Engineer, Kiev State University, Kiev, Ukraine;
1992 – 1993 Physics Teacher, High School #10, Kiev, Ukraine.
PUBLICATIONS
Over 90 publications in refereed journals and conference proceedings; the list of
publications is attached.
EDUCATION
MS (Physics) 1992, Kiev State University, Kiev, Ukraine
Ph.D. in Physics 2002, University of Toledo, Toledo, OH
CERTIFICATION
Certified by the American Board of Radiology (ABR) in Therapeutic Medical Physics,
June 2015
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TEACHING EXPERIENCE
Developed a new interdisciplinary MS/PhD level course “Device Modeling: from
Photovoltaics to Medical Physics” covering the basics of popular software
packages and modeling approaches applicable to physics and engineering,
including medical physics, photovoltaics, and other structures and devices. Taught
for the first time in Summer of 2016.
Teach core courses of the CAMPEP-accredited graduate Medical Physics
program: MPHY-6120/8120 “Radiation Dosimetry I”, MPHY-6130/8130
“Radiation Dosimetry II”; co-teach MPHY-6160/8160 “Radiation Biology”,
contribute lectures to other courses
Supervise MS and PhD graduate students in Medical physics program
Serve on committees of graduate students of Medical physics program
Taught non-calculus-based introductory “General Physics” course PHYS-2070 for
undergraduate students; Department of Physics and Astronomy, University of
Toledo. Since all of the students had non-physics majors, the main goal of the
course was to present the concepts in a simple form, appreciated by the audience
Developed and taught course PHYS-4510/5510 “Physics of Condensed Matter”;
University of Toledo. The main goal of the course was to give a conceptual
overview of the most important physical phenomena and models in the modern
condensed matter science
Supervise REU students, research resulted in publications; Department of Physics
and Astronomy, University of Toledo.
Partially supervised graduate students of PV group in the Department of Physics
and Astronomy, University of Toledo.
Taught instructional labs as Graduate teaching assistant, Department of Physics
and Astronomy, University of Toledo.
Taught physics (grade 7 through 9), High School #10, Kiev, Ukraine.
RESEARCH SUMMARY
MULTILAYER RADIATION DETECTORS FOR MEDICAL APPLICATIONS
Proposed a novel approach to design of radiation detectors, where multiple thin-film
devices are combined into a mechanical stack, providing signal reading from each layer.
The resultant noisy signals from each layer are processed together using regularization
techniques, thus allowing for restoration of the image or source spectrum. Small thickness
of individual layers helps avoiding charge trapping, and permits use of the detector
without external biasing.
THIN FILM CDTE RADIATION DETECTORS FOR MEDICAL APPLICATIONS
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Proposed a concept and design of new generation radiation detector for radiation
oncology applications, utilizing thin-film CdTe. Established superior radiation hardness
of these devices and developed their theoretical models using two most popular high-
energy radiation transport simulation software packages, BEAMnrc and MCNP5.
Provisional patent for the design has been filed.
GROWTH OF METAL WHISKERS UNDER CHARGED PARTICLE BEAMS
For the first time observed accelerated metal whiskers (MWs) growth in thin film tin (Sn)
samples on glass substrates irradiated under 6MV electron beam of medical accelerator.
MWs are hair-like protrusions that can unpredictably grow on surfaces of many
technologically important metals, for example, tin and zinc. MWs growing across electric
contacts cause shorts resulting in catastrophic failure of equipment, ranging from satellite,
automotive, and particle accelerator components to medical devices (e.g., defibrillators
and pacemakers). The observed accelerated whisker growth is attributed to electrostatic
effects due to charges trapped in an insulating substrate. A collaborative effort is
underway aiming at controllably stimulating MW growth. This is being achieved through
induction of strong electric fields in the direction perpendicular to the film surface. These
results shed light on physics of MW, and offer promise for establishing whisker-related
accelerated life testing protocols.
THERMO-BRACHYRATHERAPY IMPLANT SEED
Developed COMSOL Multiphysics model to study thermal distributions for newly
designed thermo-brachyratherapy implant for concurrent administration of radiation and
hyperthermia treatments of cancer. The ferromagnetic core (for example, Cu-Ni alloy) of
each implant produces heat when subjected to alternating electro-magnetic (EM) field and
effectively shuts off after reaching its Curie temperature thus realizing the temperature
self-regulation. Modeling of a problem where multiple seeds are arranged in a pattern
typical of a brachytherapy treatment allows finding a range of optimal parameters for seed
internal geometry and external magnetic field. Determined via Monte Carlo modeling that
combining thermal and radiation properties does not significantly alter the dosimetric
properties of the implant loaded with radioactive materials such as iodine (125I) or
palladium (103Pd).
NANOPARTICLE-AIDED RADIATION THERAPY
For the first time put forward a hypothesis and provided experimental evidence in support
of the idea that surfaces of gold (Au) and platinum (Pt) nanoparticles in aqueous media
become a source of hydroxyl and other free radicals when irradiated with high-energy
photons. Specifically, through electron paramagnetic resonance (EPR) technique
established that under Ir-192 HDR source (0.38MeV average energy) radical generation
in the vicinity of Au and Pt surfaces in water is significantly higher (by about a factor of
2) than can be accounted for by enhancement in dose deposition at the interface; the latter
modeled with MCNP. The result was observed for Au and Pt wires with diameter in nm
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range, but not for thicker wires, pointing toward the importance of the surface-to-volume
ratio parameter of the high-Z material, thus leading to the highest effect for nano-
particles. This revised model of the nanoparticle-aided radiation therapy makes the
modality potentially promising even at high energies of therapeutic photon sources.
PHYSICS OF THIN FILMS/DEVICES
Thin film device fabrication
Fabricated compound semiconductor thin films and solar cell devices using rf-sputtering
and pulsed laser deposition techniques. Samples of intentionally varied properties were
used for electrical and optical studies aimed at optimization of complete PV device
performance.
AFM/STM studies
Established the phenomenon of temporal chaos in micro-scale current-voltage
characteristics of thin-film devices: AFM current exhibits stochastic behavior in addition
to the spot-to-spot variation. This research illuminates the microscopic physics of electron
transport through thin-film and nano-particle barriers.
Shunting and dielectric breakdown
This ongoing effort is aimed at understanding the nature of dielectric breakdown in the
modern nano-scale devices (MOS transistors) and relating this phenomenon to the omni-
present shunting effects in thin-film photovoltaics. This resulted in two recent
publications in PRB and APL, and clearly has potential for more significant papers.
Piezo-photovoltaic coupling
Uncovered the phenomenon of piezo-photovoltaic coupling and related to the
morphology of the CdS film.
Nano-dipole photovoltaics
Developed new thin-film photovoltaic device principle, where the electric field is created
by a set of nanoparticles imbedded into a light-absorbing matrix. Utility patent
application has been filed.
Corrosion resistant protective tunneling layer
Recently filed a utility patent for a new principle of corrosion resistant electrode based on
the physical phenomenon of quantum tunneling rather than on the electrode chemistry.
Optical properties
Applied transmission-reflection and photoluminescence (PL) measurements to study the
near-band edge properties of CdSxTe1-x ternary system for films of different compositions
at room temperature and, at 10K; identified features related to defects and compositional
disorder. Systematically applied a below-band-gap PL excitation technique to elucidate
the effects of different steps in solar cell production.
Non-local photovoltaic response
Found the effect of non-local photovoltaic response to a scanning laser beam in
CdTe/CdS solar cells. The degree of non-locality depends on the device lateral resistance
and laser beam power, and can be as long as 1 meter in finished devices. Associated with
the non-local response are also features in PL mapping where different excitation powers
lead to different map topologies.
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Bias-dependent photoluminescence
Discovered the effect of external bias on PL intensity in thin-film CdTe PV (later verified
for thin-film CIGS PV by other groups): PL suppression under reverse bias, increase with
moderate forward bias and subsequent saturation is extremely sensitive to device
degradation. The phenomenon is shown to result from the competition between the field-
induced separation of electrons and holes and their non-radiative recombination and can
be used as a very sensitive indicator of device degradation.
Low-light mesoscopic properties of thin-film solar cells
Developed database approach to statistical analysis of nominally identical solar cells.
Discovered a crossover light intensity, below which the relative fluctuations of the PV
parameters diverge. Identified a mesoscopic nature of this effect (correlation length vs.
cell diameter). This introduced a simple uniformity diagnostic technique.
Device degradation and accelerated life testing
For the first time observed that in a polycrystalline CdTe/CdS solar cell, illuminated with
a laser beam of constant power, junction PL gradually decreased over time. Two
independent mechanisms were short-time PL decrease due to local heating and more
gradual change related to the material degradation (PL fatigue). This was attributed to
defect creation by the light-generated electrons and holes. Simple analytical model that
fits the data also provides basis for accelerated life testing using PL fatigue.
Non-uniformity diagnostics
Identified nano-scale nonuniformity as a major problem reducing device efficiency and
stability. Numerically simulated system of random diodes describing effects of
nonuniformity and successfully applied it to the thermography data, in collaboration with
the Max-Plank Institute (Germany). Introduced several other mapping techniques such as
PL, open-circuit voltage, and STM current, in particular, with an industry partner, First
Solar, LLC (co-PI in the grant “Non-uniformity losses”). Within the National CdTe team,
organized collaboration in the framework of the “Micro-nonuniformity” sub-team, tasked
with correlating non-uniformities with device performance.
Computer modeling
For the first time applied computer modeling to simulate integral parameters of composite
systems of many nano-particles possessing random diode characteristics. Commercial
software PSpice was used to investigate effects of nonuniformities on cells and large-area
integrated photovoltaic modules. This resulted in several important observations, such as
disorder topology having almost no effect on the macroscopic characteristics, scaling
dependencies, and formation of closed current loops.
INDUSTRIAL RESEARCH
At First Solar, LLC, designed and implemented a testing procedure for CdTe
photovoltaic modules where optical absorption measurements were used to characterize
CdTe/CdS alloy composition vs. probe position (alloy composition mapping). Lead X-ray
diffraction (XRD) measurement project and developed associated software aimed at
studying microcrystalline structure of CdTe films. Developed the photoluminescence
(PL) mapping technique to test the device uniformity. Developed bias-dependent PL
techniques as a tool for characterizing the device stability at the earliest stage of
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degradation. Established the use of frequency-dependent capacitance techniques to
determine the density of defect states in the device and correlated increase in defect
density with device degradation.
SECOND ORDER PHASE TRANSITIONS
Studies in molecular physics of complex liquids, including light scattering,
diffusion analyses, and spatial correlations in second order phase transitions.
MISCELLANEOUS
Database design and implementation, computer programming for scientific
applications.
CURRENT AND RECENT RESEARCH SUPPORT
Title: Joint initiative in a new type of nuclear radiation detector through faculty
development between the departments of Radiation Oncology and Physics and
Astronomy
Funding period: 06/06/12 - 06/07/16
Role: faculty served by the grant; PI: Chen C.; co-PI: Anderson L.
Agency/Mechanism: NRC, Faculty development award
Title: Feasibility of a New Thermo-brachytherapy Seed for Concurrent Brachytherapy and
Hyperthermia Treatments in Prostate Cancer
Agency/Mechanism: Subaward, main funding: NIH - STTR Phase I with BEST Medical
International, Inc.
Funding period: 09/28/2011-04/30/2013
Role: Co-I; PI: Parsai, E.I.; other Co-I’s: Feldmeier, J.J., Li, C., from BEST Medical, M.
Subramanian
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LIST OF PUBLICATIONS
Refereed Journals:
1. Whisker growth on Sn thin film accelerated under gamma-ray induced electric field,
Morgan Killefer, Vamsi Borra, Ahmed Al-Bayati, Daniel G. Georgiev, Victor G.
Karpov, E. Ishmael Parsai, and Diana Shvydka,
Journal of Physics D 50, 2017 (in press).
2. Use of novel thermobrachytherapy seeds for realistic prostate seed implant treatments,
G. Warrell, Diana Shvydka, E.I. Parsai,
Medical Physics 43, 2016, pp. 6033-6048.
3. Thin-film CdTe detector for microdosimetric study of radiation dose enhancement at
gold-tissue interface,
N. Paudel, Diana Shvydka, E.I. Parsai,
Journal of Applied Clinical Medical Physics 17, 2016, pp. 500-508.
4. A novel property of gold nanoparticles: free radical generation under microwave
irradiation,
N. Paudel, D. Shvydka, E.I. Parsai,
Medical Physics 43, 2016, pp. 1598-1602
5. Electric field stimulated growth of Zn whiskers,
D. Niraula, J. McCulloch, G. R. Warrell, R. Irving, V. G. Karpov, and Diana
Shvydka,
AIP Advances 6, 2016, p.075201-1-10.
6. Surface parameters determining a metal propensity for whiskers,
Diana Shvydka and V. G. Karpov,
Journal of Applied Physics 119, 2016, p. 085301-1-8.
7. Electron beam induced growth of tin whiskers,
A.C. Vasko, G. R. Warrell, E. Parsai, V. G. Karpov, and Diana Shvydka,
Journal of Applied Physics 118, 2015, pp.125301-1-5
8. Comparative study of experimental enhancement in free radical generation against
Monte Carlo modeled enhancement in radiation dose deposition due to the presence
of high Z materials during irradiation of aqueous media,
N. Paudel, Diana Shvydka, E. I. Parsai,
International Journal of Medical Physics, Clinical Engineering and Radiation
Oncology 4, 2015, pp. 300-307
9. Semi-shunt field emission in electronic devices,
V. G. Karpov and Diana Shvydka,
Appl. Phys. Lett. 105, 2014, p. 053904
10. Practical considerations for maximizing heat production in a novel
thermobrachytherapy seed prototype,
B. Gautam, G. Warrell, Diana Shvydka, M. Subramanian, E. I. Parsai,
Medical Physics 41, 2014, p. 023301.
11. Performance of Large Area Thin-Film CdTe Detector in Diagnostic X-Ray Imaging,
Diana Shvydka, X. Jin, E. I. Parsai,
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International Journal of Medical Physics, Clinical Engineering and Radiation
Oncology 2, 2013, pp.98-109.
12. Dosimetric and Thermal Properties of a Newly Developed Thermobrachytherapy
Seed with Ferromagnetic Core for Treatment of Solid Tumors,
B. Gautam, E. I. Parsai, Diana Shvydka, J.J. Feldmeier, M. Subramanian,
Medical Physics 39, 2012, pp.1980-1990.
13. Evaluation of a novel thermobrachytherapy seed for concurrent administration of
brachytherapy and magnetically mediated hyperthermia in treatment of solid tumors,
E.I. Parsai, B. Gautam, and Diana Shvydka,
Journal of Biomedical Phys Eng 1, 2011, pp. 5-16.
14. Design and optimization of large area thin-film CdTe detector for radiation therapy
imaging applications,
E. I. Parsai, Diana Shvydka, J. Kang,
Medical Physics 37, 2010, pp. 3980-3994.
15. Quantitative and analytical comparison of isodose distributions for shaped electron
fields from ADAC Pinnacle treatment planning system and Monte Carlo simulations,
E. I. Parsai, Diana Shvydka, J. Kang, P. Chan, D. Pearson, F. Ahmad,
Applied Radiation and Isotopes 68 2010, pp. 2174-80.
16. Response to Letter to the Editor published in ARI 67 (2009) 206-207,
E. Parsai, Diana Shvydka,
Applied Radiation and Isotopes 68 2010, pp. 467-468.
17. Theory of electronic transport in noncrystalline junctions,
M. Nardone, V.G. Karpov, Diana Shvydka, and M. L. C Attygalle,
Journal of Applied Physics 106, 2009, p. 074503.
18. From Photovoltaics to Medical Imaging: Applications of Thin Film CdTe in X-ray
Detection,
J. Kang, E. I. Parsai, D. Albin, V. G. Karpov, and Diana Shvydka,
Applied Physics Letters 93, 2008 pp. 223507-01-03.
19. Surface and build-up region dose analysis for clinical radiotherapy photon beams,
E. Ishmael Parsai, Diana Shvydka, David Pearson, M. Gopalakrishnan, and John J.
Feldmeier,
Applied Radiation and Isotopes 66, 2008, pp. 1438-1442.
20. Nanodipole photovoltaics,
Diana Shvydka and V.G. Karpov
Applied Physics Letters 92, 2008, pp. 115314 - 115318.
21. Radiation hardness studies of CdTe thin films for clinical high-energy photon beam
detectors,
Diana Shvydka, E. Parsai, J. Kang,
Nuclear Instruments and Methods in Physics Research, A 586, 2008, pp. 169-173.
22. Piezo-photovoltaic coupling in CdS-based thin-film photovoltaics,
M. Mitra, J. Drayton, M. L. C. Cooray, V. G. Karpov, and Diana Shvydka
Journal of Applied Physics 102, 2007, p.034505.
23. Pyroelectric coupling in thin-film PV,
V. G. Karpov and Diana Shvydka,
Phys. Status Solidi (Rapid Research Letters) 1, 2007, p.132.
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24. Physics of ultrathin photovoltaics,
V. G. Karpov, M.L.C. Cooray, and Diana Shvydka,
Applied Physics Letters 89, 2006, p. 163518.
25. Piezo-effect and physics of CdS based thin-film photovoltaics,
Diana Shvydka, J. Drayton, A. D. Compaan, and V. G. Karpov,
Applied Physics Letters 87, 2005, pp 123505-1-3.
26. Power generation in random diode arrays,
Diana Shvydka and V. G. Karpov,
Physical Review B 71, 2005, pp. 115314-1-5.
27. Back contact and reach-through diode effects in thin-film photovoltaics,
Y. Roussillon, V. G. Karpov, Diana Shvydka, J. Drayton, and A. D. Compaan,
Journal of Applied Physics 96, 2004, pp. 7283-7288.
28. E2 phase transition: thin film breakdown and Schottky barrier suppression,
V. G. Karpov, Diana Shvydka and Y. Roussillon,
Physical Review B 70, 2004, pp. 155332-1-5.
29. Reach-through band bending in semiconductor thin films,
Y. Roussillon, D. M. Giolando, V. G. Karpov, Diana Shvydka, and A. D. Compaan,
Applied Physics Letters 85, 2004, pp 3617-3619.
30. Random diode arrays and mesoscale physics of large-area semiconductor devices,
V. G. Karpov, A. D. Compaan, and Diana Shvydka,
Physical Review B 69, 2004, pp.045325-1-12.
31. Lock-in thermography and nonuniformity modeling of thin-film CdTe solar cells,
Diana Shvydka, J.P. Rakotoniaina, and O. Breitenstein,
Applied Physics Letters 84, 2004, pp.729-731.
32. Blocking thin film nonuniformities: photovoltaicself-healing,
Y. Roussillon, D. Giolando, Diana Shvydka, A. D. Compaan, and V. G. Karpov,
Applied Physics Letters 84, 2004, pp.616-618.
33. Admittance spectroscopy revisited: Single defect admittance and displacement
current,
V. G. Karpov, Diana Shvydka, U. Jayamaha and A. D. Compaan,
Journal of Applied Physics 94, 2003, pp. 5809-5813.
34. Photoluminescence Fatigue and Related Degradation in Thin-Film Photovoltaics,
Diana Shvydka, C. Verzella , V. G. Karpov and A. D. Compaan,
Journal of Applied Physics 94, 2003, pp. 3901-3906.
35. Low Light Divergence In Photovoltaic Parameter Fluctuations,
Diana Shvydka, V. G. Karpov and A. D. Compaan,
Applied Physics Letters 82, 2003, pp. 2157-2159.
36. Nonlocal response in CdTe photovoltaics,
Diana Shvydka, A. D. Compaan and V. G. Karpov,
Journal of Applied Physics 91, 2002, pp. 9059-9065.
37. Effects of nonuniformity in thin-film photovoltaics,
V. G. Karpov, A. D. Compaan, and Diana Shvydka,
Applied Physics Letters 80, 2002, pp. 4256-4258.
38. Bias-dependent photoluminescence in CdTe photovoltaics,
Diana Shvydka, V. G. Karpov and A. D. Compaan,
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Applied Physics Letters 80, 2002, pp. 3114-3116.
39. Optical properties of CdTe1-xSx (0 x 1): Experiment and modeling,
K. Wei, Fred H. Pollak, J.L. Freeouf, Diana Shvydka and A.D. Compaan,
Journal of Applied Physics 85, 1999, pp. 7418-7425.
40. The particularities of binary mixture component movement near the exfoliation
critical point,
L.A. Bulavin, A.D. Alekhin, D.B. Konvay (maiden name), D.I. Malyarenko,
Condensed Matter Physics Journal, n. 9, 1996, pp. 11-16.
Conference proceedings/abstracts:
1. Gamma-Ray Induced Growth of Metal Whiskers,
M. Killefer, V. Borra, A. Al-Bayati, E. Parsai, D. Georgiev, V. Karpov, D. Shvydka, ,
Medical Physics 44, p.2830 (2017).
2. An Investigation of Radiation Dose Enhancement at the Water-Gold Interface and Its
Correlation with Free Radical Generation,
K. Xie, C. Liu, E. Parsai, D. Shvydka,
Medical Physics 44, p.2909-2910 (2017).
3. The Accuracy of the Photon Beam Energy Spectrum Modeled by the Pinnacle
Treatment Planning System and Its Effects On SRS and SBRT Treatment Planning,
N Staley, N Sperling, D Shvydka,
Medical Physics 44, p.2986 (2017).
4. Thermal and Dosimetric Properties of a Ferrite-Based Thermo-Brachytherapy Seed,
G. Warrell, D. Shvydka, and E. I. Parsai,
Medical Physics 43, 2016, p.3811.
5. BEST IN PHYSICS (THERAPY): Assessment of Thin-Film CdTe as An Effective
Detector for Microdosimety at Gold-Tissue Interface,
N. Paudel, D. Shvydka, and E. I. Parsai,
Medical Physics 43, 2016, p.3869.
6. One-Pixel Prototype of a Novel Polycrystalline CdTe-Based Multilayer Detector for
Radiation Therapy Imaging Applications,
D. Shvydka, V. Karpov, G. Warrell, and E. Parsai,
Medical Physics 42, 2015, p.3743.
7. Growth of Metal Whiskers Under External Beam Irradiation: Experimental Evidence
and Implications in Medical Electronic Devices for Radiation Therapy Treatments,
D. Shvydka, G. Warrell, E. Parsai, V. Karpov, and A. Vasko,
Medical Physics 42, 2015, p.3437
8. Direct Verification of a Treatment Planning System Megavoltage Linac Beam Photon
Spectra Models, and Analysis of the Effects On Patient Plans,
D. Leheta, D. Shvydka, and E. Parsai,
Medical Physics 42, 2015, p.3395
9. Radiation and Thermal Dosimetric Considerations of a Combination of Hyperthermia
and Thermo-Brachytherapy Seeds,
G. Warrell, D. Shvydka and E.I. Parsai,
Medical Physics 42, 2015, p.3709
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10. Evaluation of a MapCHECK2(tm) Planar 2-D Diode Array for High-Dose-Rate
Brachytherapy Treatment Delivery Verifications,
N. Macey, M. Siebert, D. Shvydka, and E. Parsai,
Medical Physics 42, 2015, p.3420
11. Experimental Evaluation of Free Radical Generation in Nanoparticle-Aided HDR
Brachytherapy,
N. Paudel, D. Shvydka, E. Findsen, and E. Parsai,
International Journal of Radiation Oncology, Biology, Physics. 90, 2014. p. S198-
S199.
12. Computationally-Obtained Thermal Distributions for LDR Thermobrachytherapy
Seeds in Clinical Implants,
G. Warrell, D. Shvydka, and E. Parsai,
International Journal of Radiation Oncology, Biology, Physics. 90, 2014. p. S414.
13. Free Radical Generation Under the Conditions of Nanoparticle-Aided Microwave
Hyperthermia,
N. Paudel, D. Shvydka, V. Karpov, E. Findsen, and E. Parsai,
International Journal of Radiation Oncology, Biology, Physics. 90, 2014. p. S944-
S945.
14. Retrospective Evaluation of Thermal Coverage by Thermobrachytherapy Seed
Arrangements of Clinical LDR Prostate Implants,
G. Warrell, D. Shvydka, C. Chen, and E. Parsai,
Med. Phys. 41, 2014, p.390.
15. Nanoparticle-Aided Microwave Hyperthermia Is Accompanied By Free Radical
Generation and Enhanced Cell Kill,
N. Paudel, D. Shvydka, V. Karpov, E. Findsen, and E. Parsai,
Med. Phys. 41, 2014, p.517.
16. Design of a Novel Multilayer Detector Based on Thin-Film Cadmium Telluride for
High Energy Photon Imaging in Radiation Therapy Applications.
D. Shvydka, V.G. Karpov, N. Paudel, E.I. Parsai,
International Journal of Radiation Oncology, Biology, Physics. 87, 2013. p. S148.
17. Experimental Verification of Thermal Dose Distributions of a Novel Thermo
Brachytherapy Seed for LDR Seed Implants,
G.R. Warrell, B. Gautam, D. Shvydka, E.I. Parsai,
International Journal of Radiation Oncology, Biology, Physics. 87, 2013. p. S759-
S760.
18. Dosimetric Analysis of Irregular Surfaces Treated With the Leipzig and Valencia
HDR Skin Applicators,
E. Parsai, S. Horne, D. Shvydka, T.M. Carroll,
International Journal of Radiation Oncology, Biology, Physics. 87, 2013. p. S693.
19. Novel Multilayer Detector Design Using Polycrystalline CdTe for Radiation Therapy
Imaging Applications,
D. Shvydka,V. Karpov, N. Paudel, and E. Parsai,
Medical Physics 40, 2013, p.504.
20. Experimental Evaluation of Free Radical Generation in Nanoparticle‐Aided Radiation
Therapy
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N. Paudel, D. Shvydka, E. Findsen, and E. Parsai,
Medical Physics 40, 2013, p.282.
21. Experimental Verification of the Thermal Properties of a Novel LDR
Thermo‐Brachytherapy Seed
G. Warrell, B. Gautam, D. Shvydka, M. Subramanian, T. Ng, and E. Parsai,
Medical Physics 40, 2013, p. 466.
22. Study of the Radiation Dose Enhancement at the Gold-Tissue Interface in Gold
Nanoparticle-aided Radiation Therapy With Microdosimetry Technique,
E. Parsai, N. Paudel, D. Shvydka,
International Journal of Radiation Oncology, Biology, Physics 84, 2012. p. S871.
23. Quantitative Analysis of Head Scatter and Jaw Transmission Correction Factor for
Enhanced Dynamic Wedge Fields Using a 2-dimensional Diode Array,
E. Parsai, E.C. Dickerson, D. Shvydka,
International Journal of Radiation Oncology, Biology, Physics 84, 2012. p. S803-
S804.
24. Micro-Dosimetry Study of the Radiation Dose Enhancement at the Gold-Tissue
Interface for Nanoparticle-Aided Radiation Therapy,
N. Paudel, D. Shvydka, E. Parsai,
Medical Physics 39, 2012, p.3775.
25. Comparison of the Radiation and Thermal Dose Distributions of a Novel Thermo-
Brachytherapy Seed,
G. Warrell, D. Shvydka, B. Gautam, E. Parsai,
Medical Physics 39, 2012, p.3931.
26. Practical Considerations for Maximizing Heat Production in Novel Thermo-
Brachytherapy Seed Prototype,
B. Gautam, D. Shvydka, E. Parsai,
Medical Physics 39, 2012, p.3773.
27. Quantitative Assessment of the Source Attenuation for the New CT Compatible
Titanium Fletcher-Suit-Delclos (FSD) Gynecologic Applicator,
N. Soni, B. Gautam, D. Shvydka, E. Parsai,
Medical Physics 39, 2012, p.3774.
28. Quantitative evaluation of the radiation dose enhancement at the gold-tumor interface
when gold nanoparticles are used for radiation therapy,
D. Shvydka, N. Paudel, E. Parsai,
International Journal of Radiation Oncology, Biology, Physics 81, 2011. p. S150.
29. Study of the effect of blood perfusion rate on thermal distribution of a newly designed
thermo-brachytherapy seed for treatment of solid tumors in induction heating,
Parsai, E., Gautam, B., Shvydka, D., Feldmeier, J.J.
International Journal of Radiation Oncology, Biology, Physics 81, 2011. p. S150.
30. Finding the Optimal Thickness of Large Area Thin-Film CdTe Detector Under
Diagnostic X-Ray Beams,
X. Jin, D. Shvydka, E. Parsai,
Medical Physics 38, 2011, p.3833.
31. Investigation of the Effect of the Gold-Tissue Interface On the Radiation Dose
Enhancement Due to Gold Nanoparticles,
13
N. Paudel, D. Shvydka, E. Parsai,
Medical Physics 38, 2011, p.3562
32. Advantages of Implementation of a Self-Regulating Thermobrachy Seed for Solid
Tumors,
B. Gautam, D. Shvydka, J. Feldmeier, M. Subramanian, E. Parsai,
Medical Physics 38, 2011, p.3733.
33. A Novel Device for Delivering Combined Partial Breast Hyperthermia and Partial
Breast Irradiation,
T. White, D. Shvydka, E. Parsai,
Medical Physics 38, 2011, p.3369.
34. Thin Film CdTe Photovoltaic Detector Performance under Diagnostic X-Ray Beams,
X. Jin, I. Parsai, and D. Shvydka,
Medical Physics 37, 2010, p.3331.
35. Three-Dimentional Dosimetric and Thermal Properties of a Newly Developed
Ferromagnetic Core Thermobrachytherapy Seed for Treatment of Solid Tumors,
B. Gautam, D. Shvydka, E. Parsai, and J. Feldmeier,
Medical Physics 37, 2010, p.3391.
36. Understanding and mitigating effects of nonuniformities on reliability of thin film
photovoltaics,
Karpov V. G., Diana Shvydka,
Proceedings of SPIE 7412, Reliability of Photovoltaic Cells, Modules,
Components, and Systems II, Editors N.G. Dhere; J. H. Wohlgemuth; D. T.
Ton, 2009, p.74120L - 74120L-15.
37. Monte Carlo Simulation of Thin-Film CdTe Detector Performance for Diagnostic
Imaging Applications,
X. Jin, E.I Parsai, D.Shvydka, J. Kang,
Med. Phys. 36, 2009, p. 2462.
38. Investigating Thermal Properties of a Thermobrachytherapy Radioactive Seed for
Concurrent Brachytherapy and Hyperthermia Treatments: Design Considerations
D.Shvydka, B. Gautam, E.I Parsai, J. Feldmeier,
Med. Phys. 36, 2009, p. 2528.
39. Investigating Radiation Properties of a New Radioactive Seed for Concurrent
Brachytherapy and Hyperthermia Treatments: A Monte Carlo Study,
N. Khan, E.I Parsai, J. Feldmeier, D.Shvydka,
Med. Phys. 36, 2009, p. 2530.
40. Theoretical Analysis of a New Generation Portal Imaging Sensor Based On Thin-Film
CdTe: A Feasibility Study For Clinical High Energy X-Ray Detection,
Kang, J., Parsai, E.I. , Shvydka, D.
Medical Physics 35, 2008, p. 2988.
41. Patient Scatter Analysis for A New Generation of Portal Imaging Sensors Based On
Thin-Film Cadmium Telluride,
Shvydka, D., Parsai, E.I., Kang, J., D. Pearson, J. J. Feldmeier,
Medical Physics 35, 2008, p. 2711.
42. A New Generation of Electronic Portal Imaging Devices (EPID) Using Thin-Film
CdTe for Radiation Oncology Applications,
14
Diana Shvydka, E. Parsai, J. Kang, D. Pearson
Medical Physics 34, 2007, p. 2629.
43. Pressure dependence of photovoltaic parameters in thin film Cu(In,Ga)Se2 solar cells,
Diana Shvydka, J. Drayton1, M. Mitra, S.X. Marsillac, F. Jacob,
Proceedings of IEEE 4th World Conference on Photovoltaic Energy Conversion,
Waikoloa, Hawaii May 7-12, 2006 (IEEE, Piscataway, NJ 2006), p.465.
44. Piezo-photovoltaic coupling in thin-film CdS/CdTe solar cells,
Jennifer Drayton, M. Mitra, and Diana Shvydka,
Proceedings of IEEE 4th World Conference on Photovoltaic Energy Conversion,
Waikoloa, Hawaii May 7-12, 2006 (IEEE, Piscataway, NJ 2006).
45. Propagating Electric Impulses in Thin Film PV,
T. K. Wilson, Diana Shvydka and V. G. Karpov,
Proceedings of IEEE 4th World Conference on Photovoltaic Energy Conversion,
Waikoloa, Hawaii May 7-12, 2006 (IEEE, Piscataway, NJ 2006).
46. Understanding the Physics of CdS-based PV: Band Diagram, Interfaces, and
Nonuniformities,
V. G. Karpov, Diana Shvydka, J. Drayton, M. L. C. Cooray, and A. D. Compaan,
DOE Solar Energy Technologies Program Review Meeting, November 7-10, Denver,
Colorado, DOE/GO-1020006-2245, March (2006).
47. Spatial and Temporal Variations in Electronic Transport Through a CdTe-Based
Schottky Barrier,
Diana Shvydka, V. Parikh, V.G. Karpov and A.D. Compaan,
MRS Symposium Proceedings 865, p. F12.2, San Francisco, March 28-April 1 2005.
48. Physics of CdTe Photovoltaics: From Front to Back,
V.G. Karpov, Diana Shvydka, and Yann Roussillon,
MRS Symposium Proceedings 865, edited by W. Shafarman, T. Gessert, S. Niki, S.
Siebentritt, p. F10.1, San Francisco, March 28-April 1 2005.
49. Lateral Nonuniformity and Mesoscale Effects in Giant Area Electronics,
V. G. Karpov, Diana Shvydka, and Yann Roussillon,
MRS Symposium Proceedings 870E, edited by M. S. Shur, P. Wilson, M. Stutzmann,
p. H2.2, San Francisco, March 28-April 1 2005.
50. Modeling of nonuniformity losses in integrated large area solar cell modules,
Diana Shvydka and V. G. Karpov,
Proceedings of 31st IEEE Photovoltaic Specialists Conference, Coronado Springs,
January 3-7, 2005, pp 359-362.
51. Physical modes of thin-film PV degradation,
V. G. Karpov, Diana Shvydka, and Yann Roussillon,
Proceedings of 31st IEEE Photovoltaic Specialists Conference, Coronado Springs,
January 3-7, 2005, pp. 437-440.
52. Back contact effects in thin-film photovoltaics,
Y. Roussillon, V. G. Karpov, Diana Shvydka, J. Drayton, and A. D. Compaan,
Proceedings of 31st IEEE Photovoltaic Specialists Conference, Coronado Springs,
January 3-7, 2005, pp 441-444.
53. Reach-through mechanism in CdS/CdTe solar cell,
Y. Roussillon, V. G. Karpov, Diana Shvydka, A. D. Compaan, and D. M. Giolando,
15
Proceedings of 31st IEEE Photovoltaic Specialists Conference, Coronado Springs,
January 3-7, 2005, pp 340-343.
54. Photoluminescence fatigue in CdTe photovoltaics,
Diana Shvydka, C. Verzella and V. G. Karpov
MRS Symposium Proceedings 763, p. B5.7, San Francisco, April 21-25 2003.
55. The mesoscale physics of large-area photovoltaics,
V. G. Karpov, Diana Shvydka,Yann Roussillon, and A. D. Compaan,
Proceedings of 3d World Conference on Photovoltaic Energy Conversion, Osaka,
Japan, May 11-18, 2003.
56. External bias effect on junction photoluminescence in CdS/CdTe solar cells,
Diana Shvydka, A.D. Compaan, V.G. Karpov,
Proceedings of 29th IEEE Photovoltaic Specialists Conference, New Orleans, May
18-23, 2002, pp. 712-715.
57. Micrononuniformity effects in thin-film photovoltaics,
V. G. Karpov, A. D. Compaan, and Diana Shvydka,
Proceedings of 29th IEEE Photovoltaic Specialists Conference, New Orleans, May
18-23, 2002, pp. 708-711.
58. Capacitance - frequency analysis of CdTe photovoltaics,
Diana Shvydka, U. Jayamaha, V. G. Karpov,
Proceedings of 29th IEEE Photovoltaic Specialists Conference, New Orleans, May
18-23, 2002, pp. 752-755.
59. Photoluminescence of CdTe:Cu and CdS:Cu,
K.J. Price, D.Grecu, Diana Shvydka and A.D. Compaan,
Proceedings of 28th IEEE Photovoltaic Specialists Conference, Anchorage,
September 15-22, 2000, p. 658.
60. Rapid optimization of CdTe1-xSx absorber films and PV devices by means of the
combinatorial method,
J.J. Hanak, E. Bykov, H. Elgamel, D. Grecu, J. Putz, D. Shvydka,
Proceedings of 28th IEEE Photovoltaic Specialists Conference, Anchorage,
September 15-22, 2000, p. 495.
61. Absorption and photoluminescence studies of lightly alloyed CdTe(S) and CdS(Te),
Diana Shvydka, K.J. Price, A.D. Compaan,
MRS Symposium Proceedings 668, p.H6.2.1, San Francisco, April 16-20 2001.
Patents:
1. Concurrent delivery of interstitial thermobrachytherapy (hyperthermia and
brachytherapy) in the treatment of cancer,
E. Ishmael Parsai, Diana Shvydka, Gregory Warrell,
Patent filed 04/21/2017, Ser.# 15/493,387.
2. Method for photovoltaic healing of non-uniformities in semiconductor devices,
V. G. Karpov, Y. Roussillon, Diana Shvydka, A. D. Compaan, D. M. Giolando,
Patent filed 1/13/2005, Ser.# 11/035,170.
3. Corrosion Resistant Electrodes and Corrosion Resistant Protective Tunneling Layers,
V.G. Karpov, Diana Shvydka, and T. Kahle, utility patent filed.
16
4. SHUNT: self-healing universal nonuniformity treatment,
V.G. Karpov and Diana Shvydka, PCT patent filed.
5. System for high energy gamma ray detection,
E. Ishmael Parsai, Diana Shvydka, June Kang, provisional patent filed.
6. Nanodipole photovoltaics,
Diana Shvydka and V.G. Karpov, PCT patent filed.
Conferences and Professional Meetings (no published manuscript):
1. Accelerated Growth of Metal Whiskers under High Energy Electron Beam Irradiation,
Diana Shvydka, J. McCulloch, G. Warrell, E. I. Parsai, V. Karpov,
MRS Spring meeting, Phoenix AZ, March 28-April 1 (2016).
2. Piezo-effect in CdS-based solar cells,
Diana Shvydka, Jennifer Drayton, Mukut Mitra,
Proceedings of the 19th National CdTe R&D Meeting, Editors: H. S. Ullal. P. V.
Meyers, and C. Ferekides, Golden, Colorado, March 9-10 (2006).
3. Indicative facts and device model,
V. G. Karpov, Diana Shvydka, J. Drayton, L. Cooray, and A. D. Compaan,
Proceedings of the 19th National CdTe R&D Meeting, Editors: H. S. Ullal. P. V.
Meyers, and C. Ferekides, Golden, Colorado, March 9-10 (2006).
4. Back contact and nonuniformity,
V. G. Karpov, Diana Shvydka, J. Drayton, Y. Roussillon, and A. D. Compaan,
Proceedings of the 19th National CdTe R&D Meeting, Editors: H. S. Ullal. P. V.
Meyers, and C. Ferekides, Golden, Colorado, March 9-10 (2006).
5. Piezo-effect in CdS/CdTe solar cells,
Diana Shvydka, J.Drayton, V. G. Karpov and A.D. Compaan,
National CdTe R&D Team Meeting; Golden, CO; May 5-6, 2005.
6. Modeling of non-uniformity losses in integrated large-area modules,
Diana Shvydka and V. G. Karpov,
National CdTe R&D Team Meeting; Perrysburg, OH; February 26-27, 2004.
7. Thermography Mapping and Modeling,
Diana Shvydka, J.P. Rakotoniaina and O. Breitenstein,
National CdTe R&D Team Meeting; FSEC, Golden, CO; July 10-11, 2003.
8. Photoluminescence Mapping,
Diana Shvydka, A. D. Compaan and V. G. Karpov,
National CdTe R&D Team Meeting; FSEC, Golden, CO; July 10-11, 2003.
9. Low Light Diagnostics in Thin-Film Photovoltaics,
Diana Shvydka, V.G Karpov, A.D. Compaan,
APS March meeting, Austin, TX, March 3-7, 2003
10. Low-light diagnostics
Diana Shvydka, A. D. Compaan and V. G. Karpov,
National CdTe R&D Team Meeting; FSEC, Golden, CO; November 28-29, 2002.
11. Capacitance spectroscopy of defect states in thin film CdTe/CdS junction,
Diana Shvydka, U. Jayamaha, V. G. Karpov and A. D. Compaan,
APS March meeting, Indianapolis, IN, March 18-22 2002.
17
12. Field-dependent photoluminescence from thin-film CdTe/CdS junction,
Diana Shvydka, V. G. Karpov and A. D. Compaan,
APS March meeting, Indianapolis, IN, March 18-22 2002.
13. Characterization of Micrononuniformities by Photoluminescence Mapping,
Diana Shvydka, A. D. Compaan, A.Gupta and V. G. Karpov,
National CdTe R&D Team Meeting; FSEC, Cocoa, FL; March 14-15, 2002.
14. Capacitance Spectroscopy of Defect States,
Diana Shvydka, U. Jayamaha and V. G. Karpov,
National CdTe R&D Team Meeting; FSEC, Cocoa, FL; March 14-15, 2002.
15. Bias-dependent luminescence in CdS/CdTe cells,
A. D. Compaan, Diana Shvydka, K.J. Price, A. Vasko, V.G. Karpov,
NCPV meeting, October 2001.
16. Nonlocal optical response in CdTe photovoltaics,
Diana Shvydka, A. D. Compaan and V. G. Karpov,
NCPV meeting, October 2001.
17. Experimental study of absorption edge in CdSxTe1-x films,
Diana Shvydka, K.B. Makhratchev, I. Matulionis, A. D. Compaan
APS March meeting, Atlanta, March 1999.