Molecular engineering of Y‐series acceptors for nonfullerene organic solar cells

The power conversion efficiencies (PCEs) of single‐junction organic solar cells (OSCs) have surpassed 19%, owing to the emerging Y‐series nonfullerene acceptors (NFAs). Undoubtedly, the power and flexibility of chemical design has been a strong driver for this rapid efficiency improvement in the OSC...

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Bibliographic Details
Published in:	SusMat (Online) Vol. 2; no. 5; pp. 591 - 606
Main Authors:	He, Qiao, Ufimkin, Petr, Aniés, Filip, Hu, Xiantao, Kafourou, Panagiota, Rimmele, Martina, Rapley, Charlotte L., Ding, Bowen
Format:	Journal Article
Language:	English
Published:	Chengdu John Wiley & Sons, Inc 01-10-2022 Wiley
Subjects:	Design Efficiency Energy Energy conversion efficiency Fullerenes molecular engineering Morphology narrow bandgap Nitrogen nonfullerene organic solar cell Performance enhancement Photovoltaic cells Photovoltaics Single crystals Solar cells Y‐series acceptor
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Summary:	The power conversion efficiencies (PCEs) of single‐junction organic solar cells (OSCs) have surpassed 19%, owing to the emerging Y‐series nonfullerene acceptors (NFAs). Undoubtedly, the power and flexibility of chemical design has been a strong driver for this rapid efficiency improvement in the OSC field. Over the course of the past 3 years, a variety of modifications have been made to the structure of the Y6 acceptor, and a large number of Y‐series NFAs have been reported to further improve performance. Herein, we present our insights into the rationale behind the Y6 acceptor and discuss the design principles toward high‐performance Y‐series NFAs. It is clear that structural modifications through choice of heteroatom, soluble chains, π spacers, central cores, and end groups alter the material characteristics and properties, contributing to distinctive photovoltaic performance. Subsequently, we analyze various design strategies of Y‐series‐containing materials, including polymerized small‐molecule acceptors (PSMA), non‐fused‐ring acceptors (NFRA), and all‐fused‐ring acceptors (AFRA). This review is expected to be of value in providing effective molecular design strategies for high‐performance NFAs in future innovations. Y‐series materials are currently most promising nonfullerene acceptors in organic solar cells. A detailed comparison of Y6 and ITIC has been performed. Chemical modification approaches to Y6 are summarized along with discussion about the relationship between structural property and device performance. The progress of Y‐series‐containing materials has also been studied, which can provide further guidance for molecular design.
ISSN:	2692-4552 2766-8479 2692-4552
DOI:	10.1002/sus2.82