Xu Shaoheng, Wang Wen, Liu Hongtao, Yu Xinyu, Qin Fei, Luo Hao, Zhou Yinhua, Li Zhong'an
Key Laboratory for Material Chemistry of Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
Macromol Rapid Commun. 2022 Nov;43(22):e2200276. doi: 10.1002/marc.202200276. Epub 2022 May 26.
The development of wide-bandgap polymer donors having complementary absorption and compatible energy levels with near-infrared (NIR) absorbing nonfullerene acceptors is highly important for realizing high-performance organic solar cells (OSCs). Herein, a new thiophene-fused diazabenzo[k]fluoranthene derivative is successfully synthesized as the electron-deficient unit to construct an efficient donor-acceptor (D-A) type alternating copolymer donor, namely, PABF-Cl, using the chlorinated benzo[1,2-b:4,5-b']dithiophene as the copolymerization unit. PABF-Cl exhibits a wide optical bandgap of 1.93 eV, a deep highest occupied molecular level of -5.36 eV, and efficient hole transport. As a result, OSCs with the best power conversion efficiency of 11.8% are successfully obtained by using PABF-Cl as the donor to blend with a NIR absorbing BTP-eC9 acceptor. This work provides a new design of electron-deficient unit for constructing high-performance D-A type polymer donors.
开发与近红外（NIR）吸收型非富勒烯受体具有互补吸收和兼容能级的宽带隙聚合物供体对于实现高性能有机太阳能电池（OSC）至关重要。在此，成功合成了一种新的噻吩稠合二氮杂苯并[k]荧蒽衍生物作为缺电子单元，以氯化苯并[1,2-b:4,5-b']二噻吩为共聚单元构建了一种高效的供体-受体（D-A）型交替共聚物供体，即PABF-Cl。PABF-Cl表现出1.93 eV的宽光学带隙、-5.36 eV的深最高占据分子能级以及高效的空穴传输。结果，通过使用PABF-Cl作为供体与NIR吸收型BTP-eC9受体共混，成功获得了功率转换效率高达11.8%的OSC。这项工作为构建高性能D-A型聚合物供体提供了一种新的缺电子单元设计。
