School of Chemical and Biological Engineering, College of Engineering, Seoul National University, 599 Gwanangno, Gwanakgu, Seoul, 151-744, Korea.
Nanoscale. 2017 Nov 2;9(42):16249-16255. doi: 10.1039/c7nr05235a.
We modified phenyl-C61-butyric acid methyl ester (PCBM) for use as a stable, efficient electron transport layer (ETL) in inverted perovskite solar cells (PSCs). PCBM containing a surfactant Triton X-100 acts as the ETL and NiO nanocrystals act as a hole transport layer (HTL). Atomic force microscopy and scanning electron microscopy images showed that surfactant-modified PCBM (s-PCBM) forms a high-quality, uniform, and dense ETL on the rough perovskite layer. This layer effectively blocks holes and reduces interfacial recombination. Steady-state photoluminescence and electrochemical impedance spectroscopy analyses confirmed that Triton X-100 improved the electron extraction performance of PCBM. When the s-PCBM ETL was used, the average power conversion efficiency increased from 10.76% to 15.68%. This improvement was primarily caused by the increases in the open-circuit voltage and fill factor. s-PCBM-based PSCs also showed good air-stability, retaining 83.8% of their initial performance after 800 h under ambient conditions.
我们对苯基-C61-丁酸甲酯（PCBM）进行了修饰，将其用作倒置钙钛矿太阳能电池（PSC）中稳定、高效的电子传输层（ETL）。含有表面活性剂 Triton X-100 的 PCBM 作为 ETL，NiO 纳米晶体作为空穴传输层（HTL）。原子力显微镜和扫描电子显微镜图像显示，表面活性剂修饰的 PCBM（s-PCBM）在粗糙的钙钛矿层上形成了高质量、均匀且致密的 ETL。该层能有效阻挡空穴并减少界面复合。稳态光致发光和电化学阻抗谱分析证实，Triton X-100 提高了 PCBM 的电子提取性能。当使用 s-PCBM ETL 时，平均功率转换效率从 10.76%提高到 15.68%。这种改进主要是由于开路电压和填充因子的增加。基于 s-PCBM 的 PSCs 还表现出良好的空气稳定性，在环境条件下放置 800 小时后，其初始性能保留了 83.8%。
