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Optimizing Molecular Crystallinity and Suppressing Electron-Phonon Coupling in Completely Non-Fused Ring Electron Acceptors for Organic Solar Cells.
Dai, Tingting; Tang, Ailing; Meng, Yuhan; Dong, Chuanqi; Cong, Peiqing; Lu, Jiahao; Du, Jimin; Zhong, Yufei; Zhou, Erjun.
Afiliación
  • Dai T; National Center for Nanoscience and Technology, Beijing, 100190, China.
  • Tang A; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
  • Meng Y; National Center for Nanoscience and Technology, Beijing, 100190, China.
  • Dong C; School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China.
  • Cong P; School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China.
  • Lu J; National Center for Nanoscience and Technology, Beijing, 100190, China.
  • Du J; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China.
  • Zhong Y; College of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning, 530006, China.
  • Zhou E; School of Chemistry and Chemical Engineering, Anyang Normal University, Anyang, Henan Province, 455002, China.
Angew Chem Int Ed Engl ; 63(22): e202403051, 2024 May 27.
Article en En | MEDLINE | ID: mdl-38499468
ABSTRACT
High open-circuit voltage (Voc) organic solar cells (OSCs) have received increasing attention because of their promising application in tandem devices and indoor photovoltaics. However, the lack of a precise correlation between molecular structure and stacking behaviors of wide band gap electron acceptors has greatly limited its development. Here, we adopted an asymmetric halogenation strategy (AHS) and synthesized two completely non-fused ring electron acceptors (NFREAs), HF-BTA33 and HCl-BTA33. The results show that AHS significantly enhances the molecular dipoles and suppresses electron-phonon coupling, resulting in enhanced intramolecular/intermolecular interactions and decreased nonradiative decay. As a result, PTQ10 HF-BTA33 realizes a power conversion efficiency (PCE) of 11.42 % with a Voc of 1.232 V, higher than that of symmetric analogue F-BTA33 (PCE=10.02 %, Voc=1.197 V). Notably, PTQ10 HCl-BTA33 achieves the highest PCE of 12.54 % with a Voc of 1.201 V due to the long-range ordered π-π packing and enhanced surface electrostatic interactions thereby facilitating exciton dissociation and charge transport. This work not only proves that asymmetric halogenation of completely NFREAs is a simple and effective strategy for achieving both high PCE and Voc, but also provides deeper insights for the precise molecular design of low cost completely NFREAs.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Angew Chem Int Ed Engl Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Angew Chem Int Ed Engl Año: 2024 Tipo del documento: Article País de afiliación: China Pais de publicación: Alemania