Selective ultraviolet-harvesting transparent perovskite solar cells (T-PSCs) have attracted great interest because of their high transmittance and unique photovoltaic properties, especially in the fields of smart windows for power generation and building glass. However, owing to the unsatisfactory solubility of PbCl₂ in most conventional solvents, preparing transparent methylammonium lead chloride (MAPbCl₃) films with high quality and sufficient thickness by conventional methods poses a substantial challenge for their application deployment in T-PSCs. In this work, two novel strategies based on an ion-exchange procedure for controlling phase transition engineering (CPTE) are proposed. For CPTE-2, an optimized cubic phase MAPbCl₃ film with a large grain size and high full coverage is prepared by transforming the tetragonal phase MAPbI₃ precursor into the cubic phase MAPbCl₃. Establishing relevant models based on crystal parameters investigates the formation mechanism of this high-quality MAPbCl₃ film. Accordingly, the resultant T-PSCs exhibit remarkable film quality and micron-sized grains and reach an optimum efficiency of 0.33% (J_SC = 0.66 mA cm⁻², V_OC = 1.14 V, and FF = 43.72%).

选择性捕集紫外线的透明钙钛矿太阳能电池（T- PSCs）因其高透光率和独特的光伏特性而备受关注，尤其是在发电智能窗和建筑玻璃领域。然而，由于 PbCl ₂在大多数常规溶剂中的溶解度不令人满意，因此通过常规方法制备高质量和足够厚度的透明甲基氯化铵铅 (MAPbCl ₃ ) 薄膜对其在T- PSC 中的应用部署提出了重大挑战。在这项工作中，提出了两种基于控制相变工程 (CPTE) 的离子交换程序的新策略。对于 CPTE-2，优化的立方相 MAPbCl通过将四方相MAPbI ₃前驱体转变为立方相MAPbCl ₃制备了具有大晶粒尺寸和高全覆盖率的₃薄膜。基于晶体参数建立相关模型研究了这种高质量MAPbCl ₃薄膜的形成机制。因此，所得T- PSCs表现出卓越的薄膜质量和微米级晶粒，最佳效率为0.33%（J _SC  = 0.66 mA cm ^-2，V _OC  = 1.14 V，FF = 43.72%）。