Design of simple-structure wide-bandgap conjugated polymers based on BDT for efficient non-fullerene solar cells. (October 2021)

• Record Type: Journal Article
• Authors: Jing, Xin; Hou, Feng; Wang, Quanliang; Zhao, Yong; Liu, Xiaojie; Li, Feng; Wang, Xiangkun; Yu, Liangmin; Sun, Mingliang
• Is Part Of: Dyes and pigments. Volume 194(2021)
• Publication Date: 2021-10
• Subjects: Organic solar cells -- High efficiency -- Low voltage-loss -- Semitransparent devices; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2021.109604
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: The recent evolution of non-fullerene acceptors yields brilliant progress for organic solar cells (OSCs). However, high-performance copolymer donors with simple chemical structures for new acceptors are a few. In this work, a series of donors based on BDT are developed with ester-substituted trithiophene as a repeating acceptor unit. Copolymerized polymers exhibit slightly red-shifted absorption and down-shifted the highest occupied molecular orbital (HOMO) as the side chains turning from alkyl (3TCO-R) and oxyalkyl (3TCO-OR) to thienyl (3TCO-Th) and chlorine-substituted thienyl (3TCO-Th-Cl), respectively. As a result, the corresponding power conversion efficiency (PCE) of 3TCO-Th-Cl based devices shows the most excellent performance (PCE = 7.70%) especially in open-circuit voltage (VOC = 1 V) when blending with ITIC and its PCE makes a breakthrough with Y6 (PCE = 10.30%). Moreover, the fabricated semitransparent OSCs exhibit a rational PCE of 8.16% with average visible transparency of 16.40%. Highlights: A series of polymers based on ester-substituted trithiophene are synthesis. The polymers can deliver rational photovoltaic performance in ITIC and Y6 system. Resulted Y6 based blend possesses the potential in ST-OSCs.