CH3NH3PbI3钙钛矿太阳电池晶粒尺寸及光电性能调控

Grain Size and Photoelectric Performance Control of CH3NH3PbI3 Perovskite Solar Cells

摘要:

钙钛矿薄膜的晶粒尺寸对器件性能影响很大。采用湿润性不同的空穴传输层以及不同浓度的CH3NH3I（MAI）溶液,使用热退火和溶剂气氛退火的方法制备出CH3NH3PbI3薄膜及相应电池。测量了不同制备条件的钙钛矿薄膜的X射线衍射、扫描电子显微镜、光致发光谱,以及器件的电流密度-电压曲线。结果表明,溶剂气氛退火可以有效地增大薄膜的晶粒尺寸,提高器件的电流密度;较高浓度的MAI能将PbI2完全转化为CH3NH3PbI3,增大晶粒尺寸;不湿润的功函数更高的空穴传输层有利于电池效率的提高。制备了最高效率为13.3%的CH3NH3PbI3钙钛矿电池,为制备更大晶粒的钙钛矿薄膜与更高效率的钙钛矿太阳电池奠定了基础。

Abstract:

The perovskite film grain size has a great influence on the device performance. The hole transport layer with different wettability and CH3NH3I (MAI) solution with different concentrations were used to prepare the CH3NH3PbI3 perovskite films and solar cells by using the methods of thermal annealing and solvent annealing. The perovskite films prepared under different conditions were characterized by XRD, SEM and photoluminescence spectra, and the current densityvoltage curves of the devices were measured. The results show that solvent annealing can effectively increase the grain size of the film and increase the current density of the device; a higher concentration of MAI solution can completely convert PbI2 to CH3NH3PbI3 and increase the grain size; the nonwetting hole transport layer with higher work function is beneficial to the increase of the cell power conversion efficiency. The perovskite solar cell with the highest efficiency of 13.3% was prepared, which laid the foundation for preparing perovskite thin films with larger grain size and perovskite batteries with high efficiency.