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Non-fullerene acceptor photostability and its impact on organic solar cell lifetime / Andrew Clarke, Joel Luke, Rico Meitzner, Jiaying Wu, Yuming Wang, Harrison Lee, Emily M. Speller, Helen Bristow, Hyojung Cha, Michael Newman, Katherine Hooper, Alex Evans, Feng Gao, Harald Hoppe, Iain McCulloch, Ulrich S. Schubert, Trystan Watson, James Durrant, Wing Chung Tsoi, Ji-Seon Kim, Zhe Li

Cell Reports Physical Science, Volume: 2, Issue: 7, Start page: 100498

Swansea University Authors: Andrew Clarke, Harrison Lee, Emily M. Speller, Michael Newman, Katherine Hooper, Trystan Watson, James Durrant, Wing Chung Tsoi

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Abstract

The development of non-fullerene acceptors (NFAs) has facilitated the realization of efficient organic solar cells (OSCs) with minimal burn-in losses and excellent long-term stability. However, the role of NFA molecular structures on device stability remains unclear, limiting commercialization of NF...

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Published in: Cell Reports Physical Science
ISSN: 2666-3864
Published: Elsevier BV 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa57328
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Abstract: The development of non-fullerene acceptors (NFAs) has facilitated the realization of efficient organic solar cells (OSCs) with minimal burn-in losses and excellent long-term stability. However, the role of NFA molecular structures on device stability remains unclear, limiting commercialization of NFA-based OSCs. Herein, the photostability of 10 OSC devices, fabricated with various NFAs (O-IDTBR, EH-IDTBR, ITIC, and ITIC-M) blended with donor polymers (PTB7-Th, PffBT4T-2OD, and PBDB-T), is investigated. O-IDTBR and EH-IDTBR form highly stable devices with all three polymers, whereas ITIC and ITIC-M devices suffer from burn-in losses and long-term degradation. Conformational instability is found to be responsible for the poor photostability of ITIC and ITIC-M, resulting in poor device stability. Twisting and potential breakage of the chemical bond that links the end group to the main backbone of ITIC and ITIC-M molecules causes undesirable conformational changes. Potential strategies to overcome such detrimental photo-induced conformational changes in NFAs are proposed.
Keywords: molecular conformation, non-fullerene acceptors, photostability, organic photovoltaics, ITIC stability, IDTBR stability, Raman spectroscopy, OPV stability
College: College of Engineering
Issue: 7
Start Page: 100498