Understanding the factors affecting energy loss in organic photovoltaics (OPVs) is imperative to achieve further improvements in their efficiency and to establish design rules for the development of new materials. Here, we provide direct experimental evidence supporting correlation between charge-transfer (CT) state static disorder and energy loss. Specifically, upon studying several planar and bulk heterojunction solar cells, we demonstrate that the non-radiative energy loss component quadratically increases with increasing Gaussian CT-state disorder. We also show that by defining the total energy loss in terms of the peak of the CT-state distribution, obtained from temperature-dependent external quantum efficiency measurements, the effect of disorder on OPV performance can be unambiguously identified, offering a universal metric for quantifying energy loss across various devices.
|Original language||English (US)|
|Number of pages||14|
|State||Published - Nov 18 2022|
Bibliographical noteKAUST Repository Item: Exported on 2023-02-03
Acknowledged KAUST grant number(s): OSR-2018-KAUST-KAU Initiative-3902, OSR-2019-CARF/CCF-3079
Acknowledgements: This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences under award no. DE-SC0012458 and King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under award no: OSR-2018-KAUST-KAU Initiative-3902, OSR-2019-CARF/CCF-3079.