Effects of Flexible Conjugation-Break Spacers of Non-Conjugated Polymer Acceptors on Photovoltaic and Mechanical Properties of All-Polymer Solar Cells

• DOI: 10.1007/s40820-022-00884-8
• Publication Date: 2022-08-13T12:06:34Z
• Authors: Qiaonan Chen; Yung Hee Han; Leandro R. Franco; Cleber F. N. Marc...; Zewdneh Genene; C. Moyses Araujo; Jin-Woo Lee; Tan Ngoc-Lan Phan; Jingnan Wu; Donghong Yu; Dong Jun Kim; Taek-Soo Kim; Lintao Hou; Bumjoon J. Kim; Ergang Wang
• Keywords: Thermal Stability; Side chain; Acceptor

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 (PD) or acceptor (PA) has been demonstrated as an efficient approach to enhance both the photovoltaic (PV) properties all-PSCs. However, length dependency FCBS on certain all-PSC related not systematically explored. In this regard, we report a series new non-conjugated PAs by incorporating with various lengths (2, 4, 8 carbon atoms in thioalkyl segments). Unlike common studies so-called side-chain engineering, where longer side chains would lead better solubility those resulting polymers, work, observe that solubilities photovoltaic/mechanical are optimized proper (i.e., C2) PA named PYTS-C2. Its achieves high efficiency 11.37%, excellent robustness crack onset strain 12.39%, significantly other PAs. These results firstly demonstrate effects PV performance all-PSCs, providing effective strategy fine-tune structures highly mechanically robust PSCs.