Zhang Bing, Cai Yaohang, He Lifei, Xu Niansheng, Yuan Yi, Zhang Jing, Zhang Yuyan, Wang Peng
State Key Laboratory of Silicon and Advanced Semiconductor Materials, Department of Chemistry, Zhejiang University Hangzhou 310058 China
Chem Sci. 2024 Sep 24;15(41):17103-13. doi: 10.1039/d4sc04998e.
Developing p-type polymeric semiconductors with exceptional electrical performance, heat tolerance, and cost-effectiveness is pivotal for advancing the practical application of n-i-p perovskite solar cells. Here, we employed direct arylation polycondensation to synthesize an alternating copolymer of phenothiazine and 3,4-ethylenedioxythiophene, featuring a high glass transition temperature (175 °C). In addition to the alternation of conjugated units within the main chain, the copolymer features alternating flexible (2-octyldodecyl) and rigid (trimethylphenyl) substituents at the nitrogen positions of the phenothiazine moiety. Compared to reference polymers with solely flexible or rigid substituents, the alternating use of these moieties resulted in the polymeric semiconductor composite film with smoother morphology and enhanced hole mobility. By employing this polymer with a distinct distribution of substituents and an innovative main chain structure as a hole transport material, we fabricated perovskite solar cells achieving an average efficiency of 25.1%. These cells also exhibited excellent stabilities under conditions of 85 °C thermal storage and 45 °C operation.
开发具有卓越电性能、耐热性和成本效益的p型聚合物半导体对于推进n-i-p钙钛矿太阳能电池的实际应用至关重要。在此，我们采用直接芳基化缩聚反应合成了吩噻嗪与3,4-亚乙基二氧噻吩的交替共聚物，其具有高玻璃化转变温度（175℃）。除了主链内共轭单元的交替排列外，该共聚物在吩噻嗪部分的氮位置具有交替的柔性（2-辛基十二烷基）和刚性（三甲基苯基）取代基。与仅具有柔性或刚性取代基的参考聚合物相比，这些部分的交替使用导致聚合物半导体复合膜具有更光滑的形态和增强的空穴迁移率。通过将这种具有独特取代基分布和创新主链结构的聚合物用作空穴传输材料，我们制备的钙钛矿太阳能电池平均效率达到25.1%。这些电池在85℃热存储和45℃运行条件下也表现出优异的稳定性。
