溶剂蒸汽退火对钙钛矿薄膜形貌和电池性能的影响

摘要

针对钙钛矿太阳能电池钙钛矿吸光层在溶液法旋涂中出现的薄膜旋涂不均匀、针孔、结晶性不好的现象,采用溶剂蒸汽退火和直接接触嵌入法(DCIP)结合的方法制备了结晶均匀并且晶体比较大的钙钛矿活性层.结果表明,当二甲基亚砜(DMSO)的加入量为15 μL 时,钙钛矿的平均粒径由大约300 nm 增加到>1200 nm,对应电池的光电转化效率也由11%升高到14.33%.由此提高了钙钛矿太阳能电池的性能,并为制作面积较大的钙钛矿太阳能电池提供了依据和方法.%In view of uneven surface,pinhole and defective crystallization of perovskite ab-sorption layer by spin-coating in fabrication of perovskite solar cells (PSCs),a method combining solvent-annealing and direct contact and intercalation process (DCIP)was applied to prepare per-ovskite absorption layer with uniform crystallization and large crystal grains.The results indicate that the average particle size of perovskite increases from about 300 nm to over 1 200 nm when the addition amount of DMSO is 1 5 μL,and the PCE of the corresponding cell is also increased from 11% to 14.33%.This method provides a promising direction of promoting the performance of PSCs and fabricating large area PSCs.