TY  - JOUR
AU  - Liu, Zhifa
AU  - Siekmann, Johanna
AU  - Klingebiel, Benjamin
AU  - Rau, Uwe
AU  - Kirchartz, Thomas
TI  - Interface Optimization via Fullerene Blends Enables Open-Circuit Voltages of 1.35 V in CH3NH3Pb(I0.8Br0.2)3 Solar Cells
JO  - Advanced energy materials
VL  - 11
IS  - 16
SN  - 1614-6832
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2021-01149
SP  - 2003386
PY  - 2021
AB  - Nonradiative recombination processes are the biggest hindrance to approaching the radiative limit of the open‐circuit voltage for wide bandgap perovskite solar cells. In addition to high bulk quality, good interfaces and good energy level alignment for majority carriers at charge transport layer‐absorber interfaces are crucial to minimize nonradiative recombination pathways. By tuning the lowest‐unoccupied molecular‐orbital of electron transport layers via the use of different fullerenes and fullerene blends, open‐circuit voltages exceeding 1.35 V in CH3NH3Pb(I0.8Br0.2)3 device are demonstrated. Further optimization of mobility in binary fullerenes electron transport layers can boost the power conversion efficiency as high as 18.9%. It is noted in particular that the Voc fill factor product is >1.096 V, which is the highest value reported for halide perovskites with this bandgap.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000627073600001
DO  - DOI:10.1002/aenm.202003386
UR  - https://juser.fz-juelich.de/record/890726
ER  -