Yu Zhi-Peng, Liu Zhi-Xi, Chen Fang-Xiao, Qin Ran, Lau Tsz-Ki, Yin Jing-Lin, Kong Xueqian, Lu Xinhui, Shi Minmin, Li Chang-Zhi, Chen Hongzheng
State Key Laboratory of Silicon Materials, MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, 310027, Hangzhou, P. R. China.
Department of Physics, The Chinese University of Hong Kong, New Territories, 999077, Hong Kong, P. R. China.
Nat Commun. 2019 May 14;10(1):2152. doi: 10.1038/s41467-019-10098-z.
The flexibility in structural design of organic semiconductors endows organic solar cells (OSCs) not only great function-tunabilities, but also high potential toward practical application. In this work, simple non-fused-ring electron acceptors are developed through two-step synthesis from single aromatic units for constructing efficient OSCs. With the assistance of non-covalent interactions, these rotatable non-fused acceptors (in solution) allow transiting into planar and stackable conformation in condensed solid, promoting acceptors not only feasible solution-processability, but also excellent film characteristics. As results, decent power conversion efficiencies of 10.27% and 13.97% can be achieved in single and tandem OSCs consisting of simple solution-cast blends, in which the fully unfused acceptors exhibit exceptionally low synthetic complexity index. In addition, the unfused acceptor and its based OSCs exhibit promising stabilities under continuous illumination. Overall, this work reveals valuable insights on the structural design of simple and effective electron acceptors with great practical perspectives.
有机半导体结构设计的灵活性赋予有机太阳能电池（OSC）不仅具有强大的功能可调性，而且在实际应用方面具有很高的潜力。在这项工作中，通过从单一芳香单元的两步合成开发了简单的非稠环电子受体，用于构建高效的有机太阳能电池。在非共价相互作用的帮助下，这些可旋转的非稠合受体（在溶液中）在凝聚态固体中能够转变为平面且可堆叠的构象，这不仅促进了受体具有可行的溶液可加工性，还具有优异的薄膜特性。结果，由简单溶液浇铸共混物组成的单节和串联有机太阳能电池可实现10.27%和13.97%的良好功率转换效率，其中完全非稠合受体表现出极低的合成复杂度指数。此外，非稠合受体及其基的有机太阳能电池在连续光照下表现出良好的稳定性。总体而言，这项工作揭示了关于具有重大实际前景的简单有效电子受体结构设计的宝贵见解。
