A New Dibenzoquinoxalineimide-Based Wide-Bandgap Polymer Donor for Polymer Solar Cells

• Published in: Polymers Vol. 14; no. 17; p. 3590
• Main Authors: Wang, Xin, Wang, Zongtao, Li, Mingwei, Tu, Lijun, Wang, Ke, Xiao, Dengping, Guo, Qiang, Zhou, Ming, Wei, Xianwen, Shi, Yongqiang, Zhou, Erjun
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 30.08.2022; MDPI
• Subjects: Construction standards; Copolymerization; donor–acceptor; Energy; Energy conversion efficiency; Energy gap; Heterojunctions; imide; Indene; Open circuit voltage; Optical properties; Photovoltaic cells; polymer solar cells; Polymers; Solar batteries; Solar cells; Solar energy industry; Thin films; wide bandgap; donor–acceptor; wide bandgap; polymer solar cells; imide
• ISSN: 2073-4360; 2073-4360
• DOI: 10.3390/polym14173590

The molecular design of a wide-bandgap polymer donor is critical to achieve high-performance organic photovoltaic devices. Herein, a new dibenzo-fused quinoxalineimide (BPQI) is successfully synthesized as an electron-deficient building block to construct donor-acceptor (D-A)-type polymers, namely P(BPQI-BDT) and P(BPQI-BDTT), using benzodithiophene and its derivative, which bears different side chains, as the copolymerization units. These two polymers are used as a donor, and the narrow bandgap (2,20-((2Z,20Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo [3,4-e]thieno[2,″30':4',50]thieno[20,30:4,5]pyrrolo[3,2g]thieno[20,30:4,5]thieno[3,2-b]indole-2,10 diyl)bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile) Y6 is used as an acceptor to fabricate bulk heterojunction polymer solar cell devices. Y6, as a non-fullerene receptor (NFA), has excellent electrochemical and optical properties, as well as a high efficiency of over 18%. The device, based on P(BPQI-BDTT):Y6, showed power conversion efficiencies (PCEs) of 6.31% with a of 17.09 mA cm , an open-circuit voltage ( ) of 0.82 V, and an FF of 44.78%. This study demonstrates that dibenzo-fused quinoxalineimide is a promising building block for developing wide-bandgap polymer donors.