Bithiophene Imide‐Based “Chemically Homologous” Active Layer Enables Efficient and Stable All‐Polymer Solar Cells

Chinese Journal of Chemistry 2026 Open access

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Authors: Xinxi Yang, Henan Li, Mingqing Chen, Junyi Lu, Qingqing Bai, Jiaxu Che, Jong Bin Park, Suxiang Ma, Zhongxia Wang, Guangye Zhang, Junwu Chen, Han Young Woo
+4 more Dongdong QIN, Wei Wang, Li Niu, Han Sun
DOI: 10.1002/cjoc.70456
Cited by: 1
References: 65

Abstract

Comprehensive Summary Precise control over the active layer morphology is critical for achieving high‐performance all‐polymer solar cells (all‐PSCs). In this study, we introduce a fully “chemically homologous” strategy, in which a series of tailored solid additives, polymer donor, and polymer acceptor are constructed from the same bithiophene imide (BTI) building block. Among them, the B3 additive, which shares an identical side chain with the donor, guides the formation of an optimal fibrillar network morphology with enhanced structural order. This optimized microstructure facilitates efficient exciton dissociation and charge transport, yielding a remarkable power conversion efficiency (PCE) of 18.52%—significantly surpassing those of additive‐free (14.54%) and non‐homologous reference devices (

Fields of Study & Subjects

Organic Electronics and Photovoltaics Perovskite Materials and Applications Nanowire Synthesis and Applications

Publication details

Journal / source
Chinese Journal of Chemistry
Publisher
Wiley
Volume
44
Issue
8
Pages
1123–1133
Publication date
29 January 2026
Language
EN