Quantifying the effect of energetic disorder on organic solar cell energy loss

Saeed Uz Zaman Khan, Jules Bertrandie, Manting Gui, Anirudh Sharma, Wejdan Alsufyani, Julien F. Gorenflot, Frédéric Laquai, Derya Baran, Barry P. Rand

Research output: Contribution to journalArticlepeer-review

Abstract

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 languageEnglish (US)
Pages (from-to)2821-2834
Number of pages14
JournalJoule
Volume6
Issue number12
DOIs
StatePublished - Dec 21 2022

All Science Journal Classification (ASJC) codes

  • Energy(all)

Keywords

  • charge-transfer states
  • energy loss
  • non-radiative energy loss
  • organic solar cells
  • static disorder

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