o. lysenko - wpcf 2013, 5-8 november 2013, acireale, italy
DESCRIPTION
Single crystal diamond O. Lysenko - WPCF 2013, 5-8 November 2013, Acireale, Italy Motivation property silicon Polycrystalline diamond Single crystal diamond detector operation band gap [eV] breakdown voltage [V/cm] intrinsic resistivity [Ω/cm] electron mobility [cm2/Vs] hole mobility [cm2/Vs] 1.12 3∙105 2.3 ∙ 105 1350 480 5.4 0.5 ∙ 106 >> 106 1800 1000 5.48 107 >> 1011 1900 – 4500 1800 – 3500 + high T operation +high field operation + low leakage current + fast signal Evolution of detectors for experiments at high luminosity colliders Silicon Polycrystalline diamond films CVD single crystal diamond Ultrapure HPHT single crystal diamond with controlled physical propertiesTRANSCRIPT
O. Lysenko - WPCF 2013, 5-8 November 2013, Acireale, Italy
Preparation and characterization of single-crystal diamond for
improved particle detectors O.Lysenko, N.Novikov, V.Grushko,
O.Zanevskiy, M.Serga, V.Lysakovskiy, S.Ivakhnenko V.Bakul Institute
for Superhard Materials of the National Academy of Sciences of
Ukraine Single crystal diamond
O. Lysenko - WPCF 2013, 5-8 November 2013, Acireale, Italy
Motivation property silicon Polycrystalline diamond Single crystal
diamond detector operation band gap [eV] breakdown voltage [V/cm]
intrinsic resistivity [/cm] electron mobility [cm2/Vs] hole
mobility [cm2/Vs] 1.12 3105 2.3 105 1350 480 5.4 0.5 106 >>
106 1800 1000 5.48 107 >> 1011 1900 4500 1800 3500 + high T
operation +high field operation + low leakage current + fast signal
Evolution of detectors for experiments at high luminosity colliders
Silicon Polycrystalline diamond films CVD single crystal diamond
Ultrapure HPHT single crystal diamond with controlled physical
properties Difficulties on the way towards a perfect diamond
detector
O. Lysenko - WPCF 2013, 5-8 November 2013, Acireale, Italy
Difficulties on the way towards a perfect diamond detector Ideally
diamond detector is just a solid state ionization chamber In
reality next problems exit: nitrogen limits the life time of free
charge carriers defective surface layer creates undesirable space
charge To improve the quality of diamond detectors following
approach is used: Specified conditions of HPHT diamond growth with
low defect content Thermobaric processing of HPHT diamonds Cut
diamond plate from defined area of the crystal Idea The band
structure of diamond
O. Lysenko - WPCF 2013, 5-8 November 2013, Acireale, Italy Idea The
band structure of diamond S. Painter, D. E. Ellis, A. R. Lubinsky,
Ab Initio Calculations of the Electronic Structure and Optical
Properties of Diamond Using the Discrete Variational Method, Phys.
Rev. B, vol. 4, p. 3610, 1971 Approach 1) Synthesis of colorless
large HPHT IIa diamonds
O. Lysenko - WPCF 2013, 5-8 November 2013, Acireale, Italy Approach
1) Synthesis of colorless large HPHT IIa diamonds 2) Cut diamond
plate from defined area of the crystal 3) Specified conditions of
crystal growth Termobaric processing
O. Lysenko - WPCF 2013, 5-8 November 2013, Acireale, Italy
Termobaric processing Nitrogen is the main impurity in diamond
C-defects (nitrogen in replacing position) prevail in synthetic
diamonds Thermobaric processing allows to convert C-defects into
(less harmful) A-defects P = 6.7GPa T = 1800C t = 4 hours
Conditions of thermobaric processing: Types of defects are seen in
IR absorbtion spectra: C-defect: cm-1 A-defect: cm-1 O. Lysenko -
WPCF 2013, 5-8 November 2013, Acireale, Italy
HPHT diamond plates Future work O. Lysenko - WPCF 2013, 5-8
November 2013, Acireale, Italy
Nitrogen vacancies are actually fluorescent: when green light
strikes them, the nitrogen atoms two excitable unpaired electrons
glow a brilliant red. The realization of electrically driven
single-photon source based on a single neutral nitrogen-vacancy
centre in a diamond diode structure. a) L. Jiang, ectRepetitive
Readout of a Single Electron Spin via Quantum Logic. with Nuclear
Spin Ancillae Science 326, 267 (2009). b) N. Mizuochi, ect
Electrically driven single-photon source at room temperature in
diamond. Nature Photonics, Volume 6, Issue 5, pp (2012). O. Lysenko
- WPCF 2013, 5-8 November 2013, Acireale, Italy
Summary HPHT single crystal diamond is a good candidate for diamond
detectors of particles. HPHT diamond plates have advantages over
commonly accepted CVD plates due to absence of highly defective
intercrystallite boundaries. Specified conditions of crystal growth
allows to obtain detectors with very low defect content thus
avoiding undesirable space charge. Cutting a diamond plate from
specific zone of the crystal with extremely low nitrogen content
allows to produce detectors with contain of nitrogen less then 1015
atoms per cubic centimetre. The structure of single-crystal diamond
with a low nitrogen content should be Control using NV-centers
approach. When exposed to the NV-centers by the specific
electromagnetic radiation, they become a single-photon sources.
According to the number of observed single-photon sources it can be
concluded about the concentration of nitrogen and accumulated
radiation. Thankyou