进一步提高钙钛矿太阳能电池的光电转换效率的关键因素是减少电池内部的光生电荷复合并增强电池的光吸收能力。为了提高钙钛矿太阳能电池的效率，本项目拟制备基于CH3NH3PbI3/CdS体异质结的钙钛矿太阳能电池。相比普通CH3NH3PbI3活性层，这种CH3NH3PbI3/CdS体异质结活性层既能提高活性层的光吸收能力，又能通过有效的电荷分离减少活性层中的电荷复合。本项目将系统地研究CdS对CH3NH3PbI3/CdS体异质结活性层的表面形态、光电化学性质及电池光电性能的影响，揭示CH3NH3PbI3/CdS体异质结电池中光生载流子的产生动力学和输运机制。本项目的研究将对通过改进活性层的结构提高钙钛矿太阳能电池的光电转换效率提供新的研究方法。

Reducing the photo-generated charge recombination and enhancing light absorption are the key factors in further improving the photoelectric conversion efficiencies of perovskite solar cells (PSCs). In this project, the PSCs based on CH3NH3PbI3/CdS bulk heterojunction will be prepared to improve the efficiencies of PSCs. In comparison to common CH3NH3PbI3 active layer, CH3NH3PbI3/CdS bulk heterojunction photoactive layer can not only increase the light absorption of the active layer, but also reduce the charge recombination through effective charge separation in the active layer. In this project, the effect of CdS on the surface morphology, optical property and electrical properties of the prepared CH3NH3PbI3/CdS bulk heterojunction active layer and the device performance will be systematically studied to reveal the charge generation kinetics and transportation mechanisms of photo-generated carrier in CH3NH3PbI3/CdS heterojunction solar cells. This research will provide new methods to improve the efficiency of PSCs by improving the active layer structure.