Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences , Ningbo 315201 , China.
University of Chinese Academy of Sciences , 19 A Yuquan Rd , Shijingshan District, Beijing 100049 , China.
ACS Appl Mater Interfaces. 2018 May 2;10(17):14986-14992. doi: 10.1021/acsami.8b01147. Epub 2018 Apr 19.
Nonfullerene polymer solar cells (PSCs) have earned widespread and intense interest on account of their properties such as tunable energy levels, potential for low-cost production processes, reduced energy losses, and strong light absorption coefficients. Here, a water-/alcohol-soluble zwitterion perylene diimide zwitterion (PDI-z) consisted of sulfobetaine ion as a terminal substituent and PDI as a conjugated core was synthesized. PDI-z was employed as an electron-transport layer (ETL) for nonfullerene PSC devices, obtaining an optimal power conversion efficiency (PCE) above 11.23%. Moreover, nonfullerene PSCs with the PDI-z cathode interlayer displayed an excellent performance on a large scale of interlayer thickness, which was compatible with printing fabrication techniques. Additionally, the PDI-z interlayer presented good ability of modifying high work function metals (for instance, Au, Cu, and Ag) in nonfullerene devices, and the Ag device displayed a PCE of 9.38%. This work provides a good alternative ETL for high-efficiency nonfullerene PSCs.
非富勒烯聚合物太阳能电池（PSCs）因其可调谐能级、低成本生产工艺潜力、能量损失降低和强光吸收系数等特性而引起了广泛而强烈的关注。在这里，合成了一种由磺酸甜菜碱离子作为末端取代基和 PDI 作为共轭核的水溶性/醇溶性两性离子苝二酰亚胺两性离子（PDI-z）。PDI-z 被用作非富勒烯 PSC 器件的电子传输层（ETL），获得了超过 11.23%的最佳功率转换效率（PCE）。此外，具有 PDI-z 阴极层间的非富勒烯 PSCs 在较大的层间厚度范围内表现出优异的性能，与印刷制造技术兼容。此外，PDI-z 层间具有修饰非富勒烯器件中高功函数金属（例如 Au、Cu 和 Ag）的良好能力，Ag 器件显示出 9.38%的 PCE。这项工作为高效非富勒烯 PSCs 提供了一种很好的替代 ETL。
