The ideal electron transport layer of a high performance perovskite solar cell should have good optical transparency, high electron mobility, and an energy level alignment well-matched with the perovskite material. In this work, we investigate the role of TiCl 4 post-treatment of the mesoporous TiO 2 electron transport layer by varying the concentration of TiCl 4 and characterizing optical and electrical properties, charge carrier dynamics, and photovoltaic performance of mesoscopic CH 3 NH 3 PbI 3 solar cells. It is found that the TiCl 4 treatment provides an additional interconnection between the TiO 2 particles, leading to better percolation as evident from high resolution cross-section images and chemical maps. This enhances effective electron mobility in the material as well as significantly reduces average sub-bandgap absorption due to defects and electronic disorder determined by photothermal de...

中文翻译：

---

阐明了TiCl 4后处理对钙钛矿太阳能电池中TiO 2电子传输层渗滤的作用

高性能钙钛矿太阳能电池的理想电子传输层应具有良好的光学透明性，高电子迁移率以及能与钙钛矿材料很好匹配的能级排列。在这项工作中，我们通过改变TiCl 4的浓度并表征介观CH 3 NH 3 PbI的光学和电学性质，电荷载流子动力学和光伏性能，研究了TiCl 4后处理介孔TiO 2电子传输层的作用。 3个太阳能电池。已经发现，TiCl 4处理在TiO 2颗粒之间提供了额外的互连，从而导致更好的渗透，这从高分辨率的横截面图像和化学图可以明显看出。