ionic (in)homogeneity in metal-halide perovskitesin.bgu.ac.il/en/solar/site assets/pages/21st...emil...
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Eva L. Unger1,2, Katrin Hirselandt1, Aniela Czudek1, Carolin Rehermann1,
Klara Suchan2, Justus Just2, Aboma Merdasa1,2, Ivan Scheblykin2
1HELMHOLTZ ZENTRUM BERLIN FÜR MATERIALIEN UND ENERGIE, BERLIN, GERMANY
2DEPARTMENT OF CHEMISTRY, LUNDS UNIVERSITET, LUND, SWEDEN
7th Mar 2018, Sede Boqer, Israel
Ionic (in)homogeneity in metal-halide perovskites
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PEROVSKITE ALLOY PARAMETER SPACE
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BANDGAP TUNABILITY: DATA DIGGING
Methylammonium
Formamidinium
MA+ FA+
Cesium
Pb2+
a0
Cs+
Alternatives?
Sn2+
I- Br- Cl- Iodide Bromide
Chlloride
Experimental data sets from
literature on cation/anion alloys.
Pb-based perovskites:
Absorption onset depends on
lattice parameter
Unger et al., J. Mater. Chem. A, 5, 11401 (2017)
Eg for tandems on Si
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BANDGAP TUNABILITY: DATA DIGGING
Unger et al., J. Mater. Chem. A, 5, 11401 (2017)
ideal
for
tan
dem
s
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PHOTO-INDUCED PHASE SEGREGATION
Unger et al., J. Mater. Chem. A, 5, 11401 (2017) Hoke et al., Chem. Sci. 6 (1), 613-617 (2014)
• Dip in performance correlates with onset of low-energy phase appearance
• Understand origin of low energy sites
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IN-SITU XRD & URBACH ENERGY
Unger et al. (manuscript in preparation)
X-ray reflections of 440/008 and 400
in the dark
under illumation
low energy phase
Urbach Energy
There is apparently a low energy
phase in our samples as prepared.
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Br-rich
MAPb(BrxI1-x)3
precursor?
Br-rich
MAPb(BrxI1-x)3
phase I-rich
MAPb(BrxI1-x)3
phase
Heat drives ion
homogenization
Unger et al. (manuscript in preparation)
UNDERSTANDING GROWTH
Carolin
Rehermann
Formation
studies of
perovskite
alloys
(poster
session)
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450 500 550 600 650 700 0
1000 PL
E in
ten
sity / a
.u.
2000
3000
4000
x = 0.4 10 μm
PL Map PLE Map
450 500 550 600 650 700 0
2000
PL
E in
ten
sity / a
.u.
4000
6000
8000
10000
12000
Wavelength / nm
x = 0.6
1.0
0.75
2.5
1.5
PL Map PLE Map
PHOTO-INDUCED PHASE SEGREGATION
Aboma
Merdasa
Photo-
luminescence
excitation
Microscopy
Study
compositional
Inhomogeneity
In-situ studies
of phase-
segregation &
Degradation
(poster
session)
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BANDGAP TUNABILITY: DATA DIGGING
Jacobsson et al., En. Env. Sci. (2016)
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DYNAMIC MAXIMUM POWER POINT TRACKING
Czudek et al. (manuscript in preparation)
Aniela
Czudek
Dynamic
maximum
power point
measurement
s and
hysteresis
analysis
(see poster
K. Hirselandt)
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DYNAMIC MAXIMUM POWER POINT TRACKING
Czudek et al. (manuscript in preparation)
ca 1.5 s
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DYNAMIC MAXIMUM POWER POINT TRACKING
Czudek et al. (manuscript in preparation), K. Hirselandt (poster session)
ca 1.5 s
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DYNAMIC MAXIMUM POWER POINT TRACKING
Czudek et al. (manuscript in preparation), K. Hirselandt (poster session)
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TRANSIENT RESPONSE OF DEVICES
K. Hirselandt (poster session)
Katrin
Hirselandt
poster
session
Reproduci-
bility and
transient
response
of inverted
Perovskite
devices
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THANKS TO…
Formation
& Scaling
Hybrid Materials
< cm2
m2
Bär group
Ink
Unold group
Steve Albrecht
Antonio Abate
Bernd Rech
Klara Suchan (LU)
Justus Just (LU)
Ivan Scheblykin (LU)
Katrin Hirselandt
Steffen Braunger
Emil List-Kratochvil
Carolin
Rehermann
Aboma Merdasa
Aniela Czudek
Abou-Ras group
Hagen Heinz
Hampus Näsström
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16
+ 6 PhD
14 PhD
funded
Prof. R. van de Krol
Prof. O. Millo Dr. A. Abate (YIG)
Prof. A. Blank
Prof. N. Koch
Prof. A. Rothschild
Prof. D. Cahen, Prof G. Hodes
Prof. S. Schorr
Dr. I. Visoly Fisher
& Dr. T. Unold
Prof. M. Shalom
Dr. PD. D. Abou-Ras
Prof. A. Zaban
Dr. S. Albrecht (YIG)
Dr. E. Unger (YIG)
Prof. E. A. Katz
13 PhD
funded
Prof. B. Rech
Prof. M. Bär
Prof. L. Kronik
Slide 16
Hybrid Integrated Systems for Conversion of Solar Energy
Dr. O. Yaffe
Prof. N. Nickel
Prof. K. Lips
Prof. L. Etgar
Prof. D. Neher
There will be 6-8 new PhD positions in Berlin with placement in Israel tba soon!
Helmholtz International Research School
Dr. D. Oron
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17
HySPRINT Perovskite Lab
Slot-die coater
Inkjet Printer Perovskite Co-evaporation
Metallization
Spin-coating Characterization
Testing
Solutions
Precursors
• Corelab (external user access)
• Scalable deposition techniques up to 100 cm2
• Collaborations with Industry and Academia