Precisely Controlling Polymer Acceptors with Weak Intramolecular Charge Transfer Effect and Superior Coplanarity for Efficient Indoor All-Polymer Solar Cells with over 27% Efficiency

Bosen Zou, Ho Ming Ng, Han Yu, Pengbo Ding, Jia Yao, Dezhang Chen, Sai Ho Pun, Huawei Hu, Kan Ding, Ruijie Ma, Memoona Qammar, Wei Liu, Weiwei Wu, Joshua Yuk Lin Lai, Chaoyue Zhao, Mingao Pan, Liang Guo, Jonathan E. Halpert, Harald Ade, Gang LiHe Yan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Indoor photovoltaics (IPVs) are garnering increasing attention from both the academic and industrial communities due to the pressing demand of the ecosystem of Internet-of-Things. All-polymer solar cells (all-PSCs), emerging as a sub-type of organic photovoltaics, with the merits of great film-forming properties, remarkable morphological and light stability, hold great promise to simultaneously achieve high efficiency and long-term operation in IPV's application. However, the dearth of polymer acceptors with medium-bandgap has impeded the rapid development of indoor all-PSCs. Herein, a highly efficient medium-bandgap polymer acceptor (PYFO-V) is reported through the synergistic effects of side chain engineering and linkage modulation and applied for indoor all-PSCs operation. As a result, the PM6:PYFO-V-based indoor all-PSC yields the highest efficiency of 27.1% under LED light condition, marking the highest value for reported binary indoor all-PSCs to date. More importantly, the blade-coated devices using non-halogenated solvent (o-xylene) maintain an efficiency of over 23%, demonstrating the potential for industry-scale fabrication. This work not only highlights the importance of fine-tuning intramolecular charge transfer effect and intrachain coplanarity in developing high-performance medium-bandgap polymer acceptors but also provides a highly efficient strategy for indoor all-PSC application.

Original languageEnglish
JournalAdvanced Materials
DOIs
Publication statusPublished - 28 May 2024

Keywords

  • alkoxy side chains
  • all-polymer solar cells
  • indoor photovoltaics
  • intramolecular charge transfer effect
  • medium-bandgap polymer acceptors

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering

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