Understanding energetic disorder in electron-deficient-core-based non-fullerene solar cells

Jun Yuan, Chujun Zhang, Honggang Chen, Can Zhu, Sin Hang CHEUNG, Beibei Qiu, Fangfang Cai, Qingya Wei, Wei Liu, Hang Yin, Rui Zhang, Jidong Zhang, Ye Liu, Huotian Zhang, Weifang Liu, Hongjian Peng, Junliang Yang, Lei Meng, Feng Gao, Shu Kong SOYongfang Li, Yingping Zou*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Recent advances in material design for organic solar cells (OSCs) are primarily focused on developing near-infrared non-fullerene acceptors, typically A-DA′D-A type acceptors (where A abbreviates an electron-withdrawing moiety and D, an electron-donor moiety), to achieve high external quantum efficiency while maintaining low voltage loss. However, the charge transport is still constrained by unfavorable molecular conformations, resulting in high energetic disorder and limiting the device performance. Here, a facile design strategy is reported by introducing the “wing” (alkyl chains) at the terminal of the DA′D central core of the A-DA′D-A type acceptor to achieve a favorable and ordered molecular orientation and therefore facilitate charge carrier transport. Benefitting from the reduced disorder, the electron mobilities could be significantly enhanced for the “wing”-containing molecules. By carefully changing the length of alkyl chains, the mobility of acceptor has been tuned to match with that of donor, leading to a minimized charge imbalance factor and a high fill factor (FF). We further provide useful design strategies for highly efficient OSCs with high FF.

Original languageEnglish
Pages (from-to)1159-1168
Number of pages10
JournalScience China Chemistry
Volume63
Issue number8
DOIs
Publication statusPublished - 1 Aug 2020

Scopus Subject Areas

  • Chemistry(all)

User-Defined Keywords

  • electron-deficient-core
  • energetic disorder
  • molecular design strategy
  • non-fullerene organic solar cells

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