Enhancing the performance of the electron acceptor ITIC-Th via tailoring its end groups. (23rd January 2018)

• Record Type: Journal Article
• Authors: Li, Zeyuan; Dai, Shuixing; Xin, Jingming; Zhang, Lin; Wu, Yang; Rech, Jeromy; Zhao, Fuwen; Li, Tengfei; Liu, Kuan; Liu, Qiao; Ma, Wei; You, Wei; Wang, Chunru; Zhan, Xiaowei
• Is Part Of: Materials chemistry frontiers. Volume 2:Number 3(2018)
• Page Start: 537
• Page End: 543
• Publication Date: 2018-01-23
• Subjects: Materials science -- Periodicals; Chemistry -- Periodicals; 540
• DOI: 10.1039/c7qm00547d
• Languages: English
• ISSNs: 2052-1529

Abstract

Abstract : We incorporate electron-donating methoxy and electron-withdrawing F groups onto the terminal groups in ITIC-Th, and investigate the effects of the substituents on the electronic properties, charge transport, film morphology, and photovoltaic properties of this series. Abstract : We choose the high-performance nonfullerene acceptor ITIC-Th as an example, and incorporate electron-donating methoxy and electron-withdrawing F groups onto the terminal group 1, 1-dicyanomethylene-3-indanone (IC) to construct a small library of four fused-ring electron acceptors. With this series, we systematically investigate the effects of the substituents on the end-groups on the electronic properties, charge transport, film morphology, and photovoltaic properties of the ITIC-Th series. The electron-withdrawing ability increases from methoxylated to unsubstituted, fluorinated, and difluorinated IC, leading to a downshift of energy levels and a redshift of absorption spectra. Optimized organic solar cells based on the ITIC-Th series show power conversion efficiencies ranging from 8.88% to 12.1%.