TY - JOUR
AU - Tian, Jingjing
AU - Zhang, Kaicheng
AU - Xie, Zhiqiang
AU - Peng, Zijian
AU - Zhang, Jiyun
AU - Osvet, Andres
AU - Lüer, Larry
AU - Kirchartz, Thomas
AU - Rau, Uwe
AU - Li, Ning
AU - Brabec, Christoph J.
TI - Quantifying the Energy Losses in CsPbI 2 Br Perovskite Solar Cells with an Open-Circuit Voltage of up to 1.45 V
JO - ACS energy letters
VL - 7
SN - 2380-8195
CY - Washington, DC
PB - American Chemical Society
M1 - FZJ-2022-03847
SP - 4071 - 4080
PY - 2022
AB - CsPbI2Br perovskite solar cells (PSCs) have attracted muchinterest because of their thermodynamic stability, relatively stable cubicperovskite phase, and their potential as a top cell for tandem applications.However, the open-circuit voltage (VOC) reported to date is in most cases wellbelow the detailed balance (DB) limit for single-junction PSCs. Here, wedemonstrate that adding lead acetate to the CsPbI2Br precursor allows us tosubstantially reduce losses due to nonradiative recombination. Correspondingchampion devices reach a power conversion efficiency (η) of 16.7% and ahighest VOC value of 1.45 V, which represents 90% of the DB limit for singlejunctionPSCs at a bandgap of 1.89 eV. In order to disentangle thenonradiative recombination loss mechanisms, we quantify the origin of energylosses by calculating the radiative limit of the open-circuit voltage (VOCrad) andthe quasi-Fermi level splitting (QFLS) of perovskite films with and withoutother functional layers. We further analyze the strategies to reduce the residual losses in order to push the efficiency beyond the 90% theoretical limit.
LB - PUB:(DE-HGF)16
UR - <Go to ISI:>//WOS:000898398900001
DO - DOI:10.1021/acsenergylett.2c01883
UR - https://juser.fz-juelich.de/record/910458
ER -