Tan Zhan'ao, Li Shusheng, Wang Fuzhi, Qian Deping, Lin Jun, Hou Jianhui, Li Yongfang
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, Beijing Key Laboratory of Energy Security and Clean Utilization, North China Electric Power University, Beijing 102206, China.
Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Sci Rep. 2014 Apr 15;4:4691. doi: 10.1038/srep04691.
Low-work-function active metals are commonly used as cathode in polymer solar cells (PSCs), but sensitivity of the active metals towards moisture and oxygen results in poor stability of the devices. Therefore, solution-proceessable and stable cathode buffer layer is of great importance for the application of PSCs. Here we demonstrate high performance PSCs by employing as-prepared zirconium acetylacetonate (a-ZrAcac) film spin-cast from its ethanol solution as cathode buffer layer. The PSCs based on a low bandgap polymer PBDTBDD as donor and PC60BM as acceptor with a-ZrAcac/Al cathode demonstrated an average power conversion efficiency (PCE) of 8.75% which is significantly improved than that of the devices with traditional Ca/Al cathode. The improved photovoltaic performance is benefitted from the decreased series resistance and enhanced light harvest of the PSCs with the a-ZrAcac/Al cathode. The results indicate that a-ZrAcac is a promising high performance cathode buffer layer for fabricating large area flexible PSCs.
低功函数活性金属通常用作聚合物太阳能电池（PSC）的阴极，但活性金属对水分和氧气的敏感性导致器件稳定性较差。因此，可溶液加工且稳定的阴极缓冲层对于PSC的应用至关重要。在此，我们通过使用从乙醇溶液中旋涂制备的乙酰丙酮锆（a-ZrAcac）薄膜作为阴极缓冲层，展示了高性能的PSC。基于低带隙聚合物PBDTBDD作为供体和PC60BM作为受体，采用a-ZrAcac/Al阴极的PSC表现出平均功率转换效率（PCE）为8.75%，这比采用传统Ca/Al阴极的器件有显著提高。具有a-ZrAcac/Al阴极的PSC的光伏性能改善得益于串联电阻的降低和光捕获的增强。结果表明，a-ZrAcac是用于制造大面积柔性PSC的一种很有前景的高性能阴极缓冲层。
