We show a simple modification of spin-coating to obtain pinhole-free, well-covering and uniform films of an all-inorganic Pb-halide perovskite (Pb-HaP), on a flat substrate (i.e., not mesoporous) at standard temperature and pressure. In Pb-HaP-based devices the active film is generally fabricated by spin-coating. This is a challenging task for purely inorganic Pb-HaPs, as, except if nano-crystallites can be used, mostly rough and inhomogeneous thin films with poor optoelectronic quality are obtained. We describe a gas flow-assisted method to fabricate thin conformal films of phase-pure CsPbBr₃. First cells made with the resulting CsPbBr₃-films, yield solar conversion efficiencies up to 2.5%. Electron beam-induced current measurements of device cross-sections show uniform charge generation profiles, implying ≥ ~ 0.2 μm diffusion lengths. Non-encapsulated devices generate stable photocurrent for > 1 hr under continuous illumination at maximum power in ambient.

我们展示了旋涂的简单修改，以获得 无针孔，覆盖良好 和 制服 全无机卤化钙钛矿（Pb-HaP）的薄膜， 在平坦的基板上 （即不是介孔的） 在标准温度和压力下。在基于Pb-HaP的器件中，通常通过旋涂来制造有源膜。对于纯无机Pb-HaPs而言，这是一项艰巨的任务，因为，除非可以使用纳米微晶，否则会获得光电质量较差的大部分粗糙且不均匀的薄膜。我们描述一个气流辅助 薄的制作方法 保形的纯CsPbBr _3的薄膜。用所得的CsPbBr ₃薄膜制成的第一批电池产生的太阳能转换效率高达2.5％。电子束感应的器件横截面电流测量显示出均匀的电荷产生曲线，这意味着扩散长度≥〜0.2μm。未封装的设备在连续照明下以环境中的最大功率产生稳定的光电流，持续时间超过1小时。