Jiang Lu-Lu, Chen Meng-Meng, Tang Xiao-Dan, Tang Ying, Li Shao-Jie, Li Ying, Li Hang-Hui, Liu Hai-Rui
College of Material Science and Engineering, Henan Normal University Xinxiang 453000 China.
RSC Adv. 2023 Jun 6;13(25):16935-16942. doi: 10.1039/d3ra02391e. eCollection 2023 Jun 5.
Perovskite film-quality is a crucial factor to improve the photovoltaic properties of perovskite solar cells, which is closely related to the morphology of crystallization grain size of the perovskite layer. However, defects and trap sites are inevitably generated on the surface and at the grain boundaries of the perovskite layer. Here, we report a convenient method for preparing dense and uniform perovskite films, employing g-CN quantum dots doped into the perovskite layer by regulating proper proportions. This process produces perovskite films with dense microstructures and flat surfaces. As a result, the higher fill factor (0.78) and a power conversion efficiency of 20.02% are obtained by the defect passivation of g-CNQDs.
钙钛矿薄膜质量是提高钙钛矿太阳能电池光伏性能的关键因素，这与钙钛矿层结晶晶粒尺寸的形态密切相关。然而，在钙钛矿层的表面和晶界处不可避免地会产生缺陷和陷阱位点。在此，我们报告了一种制备致密且均匀的钙钛矿薄膜的简便方法，即通过调节适当比例将g-CN量子点掺杂到钙钛矿层中。这一过程产生了具有致密微观结构和平坦表面的钙钛矿薄膜。结果，通过g-CN量子点的缺陷钝化获得了更高的填充因子（0.78）和20.02%的功率转换效率。
