Ester-substituted copolymer-based ternary semitransparent polymer solar cells with enhanced FF and PCE

• Published in: Polymer (Guilford) Vol. 229; p. 123973
• Main Authors: Zhu, Kun, Wang, Xiangkun, He, Yan, Zhai, Xiaohua, Gao, Caiyun, Wang, Quanliang, Jing, Xin, Yu, Liangmin, Sun, Mingliang
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 16.08.2021; Elsevier BV
• Subjects: Copolymers; Devices; Fabrication; Fullerenes; Photovoltaic cells; Photovoltaics; Polymers; Solar cells
• ISSN: 0032-3861; 1873-2291
• DOI: 10.1016/j.polymer.2021.123973

Ternary polymer solar cells (PSCs) are one of the most promising high-efficiency photovoltaic devices with advantages of simple solution fabrication and single-junction structure. Herein, we fabricated ternary PSCs with PC71BM as the third component, and ester-polymer PFTzTT-3TC as donor and ITIC as host acceptor. So after treatment-annealing, ternary devices based on PFTzTT-3TC: ITIC: PC71BM (1:1:0.05) exhibited a prominently increased VOC of 0.93 V and PCE of 8.87%. The optimal devices (1:1:0.30) delivers a state of art FF of 71.76%, which is over 22% higher than the value of 58.40% in binary devices. Ternary semitransparent solar cells (1:1:0.25, 15 and 20 nm Ag as cathode) produced a PCE of 6.49% and 7.18% and an AVT of 11.91% and 9.29%, respectively. Our work demonstrated that ternary strategy is a promising solution to improve photovoltaic parameters simultaneously though rational selection of matched fullerene and non-fullerene acceptors. [Display omitted] •The FF of ternary OSC was obviously improved by the additional PC71BM from 58.40% to 71.76%.•An enhanced PCE of 8.95% was achieved in the 30 wt% PC71BM incorporated ternary OSC.•Applying ester-polymer into ternary semitransparent PSCs was reported firstly.