TY  - JOUR
AU  - Haffner-Schirmer, Julian
AU  - Le Corre, Vincent Marc
AU  - Forberich, Karen
AU  - Egelhaaf, Hans Joachim
AU  - Osterrieder, Tobias
AU  - Wortmann, Jonas
AU  - Liu, Chao
AU  - Weitz, Paul
AU  - Heumüller, Thomas
AU  - Bornschlegl, Andreas Josef
AU  - Wachsmuth, Josua
AU  - Distler, Andreas
AU  - Wagner, Michael
AU  - Peng, Zijian
AU  - Lüer, Larry
AU  - Brabec, Christoph Joseph
TI  - A High Throughput Platform to Minimize Voltage and Fill Factor Losses
JO  - Advanced energy materials
VL  - 15
IS  - 17
SN  - 1614-6832
CY  - Weinheim
PB  - Wiley-VCH
M1  - FZJ-2025-02639
SP  - 2403479
PY  - 2025
AB  - Organic photovoltaics (OPV) now can exceed 20% power conversion efficiency in single junction solar cells. To close the remaining gap to competing technologies, both fill factor and open-circuit voltage must be optimized. The Langevin reduction factor is a well-known concept that measures the degree to which charge extraction is favored over charge recombination. It is therefore ideally suited as an optimization target in high-throughput workflows; however, its evaluation so far requires expert interaction. Here, an integrated high-throughput workflow is presented, able to obtain the Langevin reduction factor within a few seconds with high accuracy without human intervention and thus suited for autonomous experiments. This is achieved by combining evidence from UV–vis spectra, current–voltage curves, and a novel implementation of microsecond transient absorption kinetics allowing, for the first time, the intrinsic determination of charge absorption cross-sections, which is crucial to reporting stationary charge densities. The method is demonstrated by varying the donor:acceptor ratio of the high performance OPV blend PM6:Y12. The high reproducibility of the method allows to find a strictly exponential relationship between the PM6 exciton energy and the Langevin reduction factor.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001395020500001
DO  - DOI:10.1002/aenm.202403479
UR  - https://juser.fz-juelich.de/record/1042670
ER  -