Journal article 132 views 46 downloads
Non-fullerene acceptor photostability and its impact on organic solar cell lifetime
,
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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DOI (Published version): 10.1016/j.xcrp.2021.100498
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...
| Published in: | Cell Reports Physical Science |
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| ISSN: | 2666-3864 |
| Published: |
Elsevier BV
2021
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| Online Access: |
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| 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. |
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| 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 |