1

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

2

PEROVSKITE ALLOY PARAMETER SPACE

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

BANDGAP TUNABILITY: DATA DIGGING

Unger et al., J. Mater. Chem. A, 5, 11401 (2017)

ideal

for

tan

dem

s

5

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

6

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.

7

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)

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)

BANDGAP TUNABILITY: DATA DIGGING

Jacobsson et al., En. Env. Sci. (2016)

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)

DYNAMIC MAXIMUM POWER POINT TRACKING

Czudek et al. (manuscript in preparation)

ca 1.5 s

DYNAMIC MAXIMUM POWER POINT TRACKING

Czudek et al. (manuscript in preparation), K. Hirselandt (poster session)

ca 1.5 s

DYNAMIC MAXIMUM POWER POINT TRACKING

Czudek et al. (manuscript in preparation), K. Hirselandt (poster session)

TRANSIENT RESPONSE OF DEVICES

K. Hirselandt (poster session)

Katrin

Hirselandt

poster

session

Reproduci-

bility and

transient

response

of inverted

Perovskite

devices

15

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

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

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