Inorganic perovskite solar cells (PSCs) are promising for achieving long-term operational stability with good device performance. Here, we report the fabrication of inorganic CsPbI₂Br-based perovskite thin films with a well-defined CsPbI_3−xBr_x composition gradient in the surface region by a scalable, orthogonal processable spray-coating approach. The graded structure broadens absorption wavelength range and increases carrier lifetime, but it also causes electrical field redistribution within a device stack for more efficient charge separation and collection. With this approach, we obtained a power conversion efficiency of 16.81% for a 0.096-cm² PSC. We further demonstrated a monolithically integrated perovskite submodule based on the graded CsPbI_3−xBr_x by spray coating with an efficiency of 13.82% (112-cm² aperture area) and ∼9% degradation over 1,000-h continuous 1-sun light soaking.

无机钙钛矿太阳能电池（PSC）具有良好的器件性能，有望实现长期的运行稳定性。在这里，我们报告了通过可扩展的，可正交加工的喷涂方法，在表面区域形成了具有明确定义的CsPbI _3-x Br _x组成梯度的无机CsPbI ₂ Br基钙钛矿薄膜。渐变结构拓宽了吸收波长范围并延长了载流子寿命，但它也导致电场在器件堆栈中重新分布，从而更有效地分离和收集电荷。通过这种方法，对于0.096-cm ²的功率转换效率为16.81％PSC。我们进一步展示了基于CsPbI _3-x Br _x的整体钙钛矿子模块，通过喷涂进行喷涂，在1,000小时连续的1-sun光线浸泡下，其效率为13.82％（112 cm ²孔径面积），降解率约为9％。 。