Tan Licheng, Wang Yilin, Zhang Jingwen, Xiao Shuqin, Zhou Huanyu, Li Yaowen, Chen Yiwang, Li Yongfang
College of Chemistry Nanchang University 999 Xuefu Avenue Nanchang 330031 China.
Institute of Polymers and Energy Chemistry Nanchang University 999 Xuefu Avenue Nanchang 330031 China.
Adv Sci (Weinh). 2019 Feb 7;6(7):1801180. doi: 10.1002/advs.201801180. eCollection 2019 Apr 3.
Landmark power conversion efficiency (PCE) over 14% has been accomplished for single-junction polymer solar cells (PSCs). However, the inevitable fracture of inorganic transporting layers and deficient interlayer adhesion are critical challenges to achieving the goal of flexible PSCs. Here, a bendable and thickness-insensitive Al-doped ZnO (AZO) modified by polydopamine (PDA) has emerged as a promising electron transporting layer (ETL) in PSCs. It has special ductility and adhesion to the active layer for improving the mechanical durability of the device. Nonfullerenes PSCs based on PBDB-T-2F:IT-4F with AZO:1.5% PDA (80 nm) ETL yield the best PCE of 12.7%. More importantly, a prominent PCE, approaching 11.5%, is reached for the fully flexible device based on Ag-mesh flexible electrode, and the device retains >91% of its initial PCE after bending for 1500 cycles. Such thickness insensitivity, mechanical durability, and interfacial adhesion properties for the inorganic ETLs are desired for the development of flexible and wearable PSCs with reliable photovoltaic performance and large-area roll-to-roll printing manufacture.
单结聚合物太阳能电池（PSC）已实现超过14%的里程碑式功率转换效率（PCE）。然而，无机传输层不可避免的断裂和层间附着力不足是实现柔性PSC目标的关键挑战。在此，一种由聚多巴胺（PDA）改性的可弯曲且对厚度不敏感的铝掺杂氧化锌（AZO）已成为PSC中有前景的电子传输层（ETL）。它对活性层具有特殊的延展性和附着力，可提高器件的机械耐久性。基于PBDB-T-2F:IT-4F且采用AZO:1.5% PDA（80纳米）ETL的非富勒烯PSC的最佳PCE为12.7%。更重要的是，基于银网柔性电极的全柔性器件的PCE达到了近11.5%，并且该器件在弯曲1500次循环后仍保留其初始PCE的91%以上。对于开发具有可靠光伏性能和大面积卷对卷印刷制造的柔性及可穿戴PSC而言，无机ETL的这种厚度不敏感性、机械耐久性和界面附着力特性是必不可少的。
