15% Efficiency All-Polymer Solar Cells Based on a Polymer Acceptor Containing B←N Unit

• Published in: Chinese journal of polymer science Vol. 40; no. 8; pp. 989 - 995
• Main Authors: Zhang, Ying-Ze, Wang, Ning, Wang, Ying-Hui, Miao, Jun-Hui, Liu, Jun, Wang, Li-Xiang
• Format: Journal Article
• Language: English
• Published: Singapore Springer Nature Singapore 01.08.2022; Springer Nature B.V
• Subjects: Blade coating; Characterization and Evaluation of Materials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Copolymers; Energy conversion efficiency; Indene; Industrial Chemistry/Chemical Engineering; Photovoltaic cells; Polymer Sciences; Polymers; Research Article; Solar cells; Boron-nitrogen coordination bond; Polymer acceptors; All-polymer solar cells; Organic photovoltaic
• ISSN: 0256-7679; 1439-6203
• DOI: 10.1007/s10118-022-2790-5

The development of new polymer acceptors strongly paves the power conversion efficiency (PCE) improvement of all polymer solar cells (all-PSCs). Herein, we develop a new polymer acceptor PBN26, which is the alternating copolymer of 2,2′-((2Z,2′Z)-((12,13-bis(2-octyldodecyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]thiadiazolo[3,4-e]thieno[2″,3″:4′,5′]thieno[2′,3′:4,5]pyrrolo[3,2-g]thieno[2′,3′:4,5]thieno[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1 H -indene-2,1-diylidene))dimalononitrile and B←N bridged thienylthiazole (BNTT). The optimized all-PSCs device based on PBN26 exhibits a PCE of 15.09%, which is the highest value of the all-PSCs based on B←N-based polymer acceptors at present. Moreover, we also fabricate an all-PSC module with active area of 10 cm 2 by blade coating, which exhibits a PCE of 8.78%. These results prove that polymer acceptors containing B←N units are promising for all-PSC device applications.