Chen Qiaonan, Han Yung Hee, Franco Leandro R, Marchiori Cleber F N, Genene Zewdneh, Araujo C Moyses, Lee Jin-Woo, Phan Tan Ngoc-Lan, Wu Jingnan, Yu Donghong, Kim Dong Jun, Kim Taek-Soo, Hou Lintao, Kim Bumjoon J, Wang Ergang
Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou, 510632, People's Republic of China.
Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96, Göteborg, Sweden.
Nanomicro Lett. 2022 Aug 13;14(1):164. doi: 10.1007/s40820-022-00884-8.
A series of non-conjugated acceptor polymers with flexible conjugation-break spacers (FCBSs) of different lengths were synthesized. The effect of FCBSs length on solubility of the acceptor polymers, and their photovoltaic and mechanical properties in all-polymer solar cells were explored. This work provides useful guidelines for the design of semiconducting polymers by introducing FCBS with proper length, which can giantly improved properties that are not possible to be achieved by the state-of-the-art fully conjugated polymers.
All-polymer solar cells (all-PSCs) possess attractive merits including superior thermal stability and mechanical flexibility for large-area roll-to-roll processing. Introducing flexible conjugation-break spacers (FCBSs) into backbones of polymer donor () or polymer acceptor () has been demonstrated as an efficient approach to enhance both the photovoltaic (PV) and mechanical properties of the all-PSCs. However, length dependency of FCBS on certain all-PSC related properties has not been systematically explored. In this regard, we report a series of new non-conjugated s by incorporating FCBS with various lengths (2, 4, and 8 carbon atoms in thioalkyl segments). Unlike common studies on so-called side-chain engineering, where longer side chains would lead to better solubility of those resulting polymers, in this work, we observe that the solubilities and the resulting photovoltaic/mechanical properties are optimized by a proper FCBS length (, C2) in named PYTS-C2. Its all-PSC achieves a high efficiency of 11.37%, and excellent mechanical robustness with a crack onset strain of 12.39%, significantly superior to those of the other s. These results firstly demonstrate the effects of FCBS lengths on the PV performance and mechanical properties of the all-PSCs, providing an effective strategy to fine-tune the structures of s for highly efficient and mechanically robust PSCs. [Image: see text]
The online version contains supplementary material available at 10.1007/s40820-022-00884-8.
合成了一系列具有不同长度柔性共轭断裂间隔基（FCBSs）的非共轭受体聚合物。探讨了FCBSs长度对受体聚合物溶解性及其在全聚合物太阳能电池中的光伏和机械性能的影响。这项工作通过引入适当长度的FCBS为半导体聚合物的设计提供了有用的指导方针，这可以极大地改善性能，而这些性能是最先进的完全共轭聚合物无法实现的。
全聚合物太阳能电池（all-PSCs）具有吸引人的优点，包括卓越的热稳定性和用于大面积卷对卷加工的机械柔韧性。将柔性共轭断裂间隔基（FCBSs）引入聚合物供体（）或聚合物受体（）的主链已被证明是提高全聚合物太阳能电池的光伏（PV）和机械性能的有效方法。然而，FCBS对某些与全聚合物太阳能电池相关性能的长度依赖性尚未得到系统研究。在这方面,我们报道了一系列新的非共轭物，通过引入具有不同长度（硫代烷基链段中含2、4和8个碳原子）的FCBS。与关于所谓侧链工程的常见研究不同，在那些研究中较长的侧链会导致所得聚合物具有更好的溶解性，在这项工作中，我们观察到在名为PYTS-C2的中，通过适当的FCBS长度（，C2）可以优化溶解性以及所得的光伏/机械性能。其全聚合物太阳能电池实现了11.37% 的高效率，以及12.39% 的裂纹起始应变的优异机械稳健性，明显优于其他的。这些结果首次证明了FCBS长度对全聚合物太阳能电池光伏性能和机械性能的影响，为微调聚合物结构以实现高效且机械稳健的聚合物太阳能电池提供了一种有效策略。[图片：见正文]
网络版包含可在10.1007/s40820-022-00884-8获取的补充材料。
