Quasi-steady-state measurement of exciton diffusion lengths in organic semiconductors

Drew B. Riley; Oskar J. Sandberg; Wei Li; Paul Meredith; Ardalan Armin

doi:10.1117/12.2621270

24 May 2022 Quasi-steady-state measurement of exciton diffusion lengths in organic semiconductors

Drew B. Riley, Oskar J. Sandberg, Wei Li, Paul Meredith, Ardalan Armin

Proceedings Volume 12149, Organic Electronics and Photonics: Fundamentals and Devices III; 1214905 (2022) https://doi.org/10.1117/12.2621270
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Exciton diffusion plays a decisive role in determining the recent rise in charge-generation yield (CGY) and powerconversion efficiency brought about by non-fullerene acceptor (NFA) solar cells. In this presentation a technique, named pulsed-PLQY, is introduced to measure the exciton diffusion length in organic semiconductors through exciton-exciton annihilation (EEA) without the need for temporal measurements. Pulsed-PLQY is validated by comparing to established EEA techniques using both simulated and experimental results. It is found that Pulsed-PLQY conserves the validity of established EEA techniques while the implementation is faster, easier, significantly simplifies the equipment required, and is less sensitive to experimental conditions than traditional EEA techniques. Utilising pulsed-PLQY, it is found that NFA’s have increased diffusion lengths, compared to fullerene acceptors, and that this increase is driven by increases in diffusivity

Conference Presentation

Citation Download Citation

Drew B. Riley, Oskar J. Sandberg, Wei Li, Paul Meredith, and Ardalan Armin "Quasi-steady-state measurement of exciton diffusion lengths in organic semiconductors", Proc. SPIE 12149, Organic Electronics and Photonics: Fundamentals and Devices III, 1214905 (24 May 2022); https://doi.org/10.1117/12.2621270

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