Zhang Weifang, Li Zicha, Zhao Suling, Xu Zheng, Qiao Bo, Song Dandan, Wageh S, Al-Ghamdi Ahmed
Key Laboratory of Luminescence and Optical Information, Ministry of Education, Beijing Jiaotong University, Beijing 100044, China.
Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia.
Materials (Basel). 2020 Mar 14;13(6):1324. doi: 10.3390/ma13061324.
At present, most high-performance non-fullerene materials are centered on fused rings. With the increase in the number of fused rings, production costs and production difficulties increase. Compared with other non-fullerenes, small molecule INTIC has the advantages of easy synthesis and strong and wide infrared absorption. According to our previous report, the maximum power conversion efficiency (PCE) of an organic solar cell using PTB7-Th:INTIC as the active layer was 7.27%. In this work, other polymers, PTB7, PBDB-T and PBDB-T-2F, as the donor materials, with INTIC as the acceptor, are selected to fabricate cells with the same structure to optimize their photovoltaic performance. The experimental results show that the optimal PCE of PBDB-T:INTIC based organic solar cells is 11.08%, which, thanks to the open voltage (V) increases from 0.80 V to 0.84 V, the short circuit current (J) increases from 15.32 mA/cm to 19.42 mA/cm and the fill factor (FF) increases from 60.08% to 67.89%, then a 52.4% improvement in PCE is the result, compared with the devices based on PTB7-Th:INTIC. This is because the PBDB-T:INTIC system has better carrier dissociation and extraction, carrier transportation and higher carrier mobility.
目前，大多数高性能非富勒烯材料都以稠环为核心。随着稠环数量的增加，生产成本和生产难度也随之增加。与其他非富勒烯相比，小分子INTIC具有合成容易、红外吸收强且范围广的优点。根据我们之前的报告，以PTB7-Th:INTIC作为活性层的有机太阳能电池的最大功率转换效率（PCE）为7.27%。在这项工作中，选择其他聚合物PTB7、PBDB-T和PBDB-T-2F作为供体材料，以INTIC作为受体，制备具有相同结构的电池以优化其光伏性能。实验结果表明，基于PBDB-T:INTIC的有机太阳能电池的最佳PCE为11.08%，这得益于开路电压（V）从0.80 V增加到0.84 V，短路电流（J）从15.32 mA/cm增加到19.42 mA/cm，填充因子（FF）从60.08%增加到67.89%，与基于PTB7-Th:INTIC的器件相比，PCE提高了52.4%。这是因为PBDB-T:INTIC体系具有更好的载流子解离和提取、载流子传输以及更高的载流子迁移率。
