Journal Article

FZJ-2025-02639

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png A High Throughput Platform to Minimize Voltage and Fill Factor Losses

Haffner-Schirmer, J. (Corresponding author)FZJ* ; Le Corre, V. M.FZJ* ; Forberich, K.FZJ* ; Egelhaaf, H. J. ; Osterrieder, T.FZJ* ; Wortmann, J.FZJ* ; Liu, C.FZJ* ; Weitz, P. ; Heumüller, T.FZJ* ; Bornschlegl, A. J. ; Wachsmuth, J. ; Distler, A. ; Wagner, M.FZJ* ; Peng, Z. ; Lüer, L. (Corresponding author) ; Brabec, C. J. (Corresponding author)FZJ*

2025
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/aenm.202403479  doi:10.34734/FZJ-2025-02639

Abstract: 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.

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Contributing Institute(s):

1. Helmholtz-Institut Erlangen-Nürnberg Erneuerbare Energien (IET-2)

Research Program(s):

1. 1214 - Modules, stability, performance and specific applications (POF4-121) (POF4-121)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 25 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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