Yang Hang, Bao Sunan, Fan Hongyu, Fan Chenling, Zhu Xianming, Cui Chaohua, Li Yongfang
Laboratory of Advanced Optoelectronic Materials, Suzhou Key Laboratory of Novel Semiconductor-Optoelectronics Materials and Devices, College of Chemistry Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Macromol Rapid Commun. 2022 Nov;43(22):e2100925. doi: 10.1002/marc.202100925. Epub 2022 Feb 24.
Currently, rational design of polymer acceptors is desirable but there is still a challenge to develop high-performance all-polymer solar cells (all-PSCs). In this work, brominated thienyl-fused malononitrile-based monomer is employed to copolymerize with indacenodithiophene (IDT) and benzodithiophene (BDT)-based linking units to develop two polymerized small molecule acceptors (PSMAs) PIDT and PBDT, respectively, for all-PSCs. The two PSMAs show similar absorption edges, while PBDT shows a slightly higher lowest unoccupied molecular orbital (LUMO) energy level than PIDT. Benefitted from the relatively high LUMO levels of the two polymer acceptors, notable open-circuit voltage (V ) values over 1.0 V are achieved when using them as acceptor to blend with PTQ10 as polymer donor. Particularly, the all-PSC based on PTQ10:PIDT demonstrates a power conversion efficiency of 10.19%, with an outstanding Voc of 1.10 V benefitted from the higher LUMO energy level of PIDT acceptor. The results demonstrate a feasible strategy to design PSMAs by selecting appropriate linking units for increasing the V and improving the efficiency of all-PSCs.
目前，聚合物受体的合理设计是可取的，但开发高性能全聚合物太阳能电池（全聚合物太阳能电池）仍然面临挑战。在这项工作中，采用溴化噻吩基稠合丙二腈基单体分别与茚并二噻吩（IDT）和苯并二噻吩（BDT）基连接单元共聚，以开发两种用于全聚合物太阳能电池的聚合小分子受体（PSMA）PIDT和PBDT。这两种PSMA具有相似的吸收边缘，而PBDT的最低未占据分子轨道（LUMO）能级略高于PIDT。受益于这两种聚合物受体相对较高的LUMO能级，当将它们用作受体与作为聚合物供体的PTQ10共混时，可实现超过1.0 V的显著开路电压（V）值。特别是，基于PTQ10:PIDT的全聚合物太阳能电池表现出10.19%的功率转换效率，得益于PIDT受体较高的LUMO能级，其开路电压高达1.10 V。结果表明，通过选择合适的连接单元来设计PSMA以提高全聚合物太阳能电池的开路电压和效率是一种可行的策略。
