Статья

Polymer Donor with a Simple Skeleton and Minor Siloxane Decoration Enables 19% Efficiency of Organic Solar Cells

Xing ChenInstitute of Polymer Optoelectronic Materials & Devices Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials State Key Laboratory of Luminescent Materials & Devices South China University of Technology Guangzhou 510640 P. R. ChinaMingqing ChenInstitute of Polymer Optoelectronic Materials & Devices Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials State Key Laboratory of Luminescent Materials & Devices South China University of Technology Guangzhou 510640 P. R. ChinaJiahao LiangInstitute of Polymer Optoelectronic Materials & Devices Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials State Key Laboratory of Luminescent Materials & Devices South China University of Technology Guangzhou 510640 P. R. ChinaHaizhen LiuInstitute of Polymer Optoelectronic Materials & Devices Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials State Key Laboratory of Luminescent Materials & Devices South China University of Technology Guangzhou 510640 P. R. ChinaXianglun XieInstitute of Polymer Optoelectronic Materials & Devices Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials State Key Laboratory of Luminescent Materials & Devices South China University of Technology Guangzhou 510640 P. R. ChinaLianjie ZhangInstitute of Polymer Optoelectronic Materials & Devices Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials State Key Laboratory of Luminescent Materials & Devices South China University of Technology Guangzhou 510640 P. R. ChinaDongge MaInstitute of Polymer Optoelectronic Materials & Devices Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials State Key Laboratory of Luminescent Materials & Devices South China University of Technology Guangzhou 510640 P. R. ChinaJunwu ChenInstitute of Polymer Optoelectronic Materials & Devices Guangdong Basic Research Center of Excellence for Energy & Information Polymer Materials State Key Laboratory of Luminescent Materials & Devices South China University of Technology Guangzhou 510640 P. R. China

2024en

ABI

Аннотация

Abstract Development of polymer donors with simple chemical structure and low cost is of great importance for commercial application of organic solar cells (OSCs). Here, side‐chain random copolymer PMQ‐Si605 with a simply 6,7‐difluoro‐3‐methylquinoxaline‐thiophene backbone and 5% siloxane decoration of side chain is synthesized in comparison with its alternating copolymer PTQ11. Relative to molecular weight ( M n ) of 28.3 kg mol −1 for PTQ11, the random copolymer PMQ‐Si605 with minor siloxane decoration is beneficial for achieving higher M n up to 51.1 kg mol −1 . In addition, PMQ‐Si605 can show stronger aggregation ability and faster charge mobility as well as more efficient exciton dissociation in active layer as revealed by femtosecond transient absorption spectroscopy. With L8‐BO‐F as acceptor, its PMQ‐Si605 based OSCs display power conversion efficiency (PCE) of 18.08%, much higher than 16.21% for PTQ11 based devices. With another acceptor BTP‐H2 to optimize the photovoltaic performance of PMQ‐Si605, further elevated PCEs of 18.50% and 19.15% can be achieved with the binary and ternary OSCs, respectively. Furthermore, PMQ‐Si605 based active layers are suitable for processing in high humidity air, an important factor for massive production of OSCs. Therefore, the siloxane decoration on polymer donors is promising, affording PMQ‐Si605 as a high‐performing and low cost candidate.

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Идентификаторы

DOI: 10.1002/adma.202313074

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