甲脒碘化铅单晶基钙钛矿太阳能电池的研究  

High performance perovskite solar cells synthesized by dissolving FAPbI3 single crystal

作　　者：朱咏琪 刘钰雪 石洋 吴聪聪 Zhu Yong-Qi;Liu Yu-Xue;Shi Yang;Wu Cong-Cong(School of Materials Science and Engineering,Hubei University,Wuhan 430062,China)

机构地区：[1]湖北大学材料科学与工程学院,武汉430062

出　　处：《物理学报》2023年第1期338-345,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62004064);湖北省重点研发计划项目(批准号:2022BAA096)资助的课题。

摘　　要：近年来,CH(NH_(2))_(2)PbI_(3)(FAPbI_(3))由于其带隙接近理想值而受到了广泛关注,成为钙钛矿太阳能电池中最具吸引力的光电功能材料.然而由碘甲脒(FAI)和碘化铅(PbI_(2))作为前驱体制备的传统钙钛矿层化学计量比不精准,缺陷密度大,稳定性差且结晶度较低,导致钙钛矿太阳能电池性能很难进一步提高.本文采用FAPbI_(3)单晶制备的钙钛矿薄膜具有高结晶度,高稳定性,精确的化学计量比和低缺陷密度.单晶钙钛矿薄膜的晶粒尺寸大,晶界少,导致晶界处缺陷较少,提高了钙钛矿太阳能电池的短路电流密度(J_(SC))和开路电压(V_(OC)),使其光电转换效率有了大幅度的提高.本文为制备高稳定性、高结晶度和低缺陷密度的钙钛矿太阳能电池提供了一种有效策略.In recent years,CH(NH_(2))_(2)PbI_(3)(FAPbI_(3))has received extensive attention due to the suitable band gap,becoming the most attractive photoelectric functional material in perovskite solar cells.However,the traditional perovskite layer prepared by formamidine iodide(FAI)and lead iodide(PbI_(2))has inaccurate stoichiometric ratio,high defect density,low stability,and low crystallinity,which makes it challenging to improve the performance of perovskite solar cells further.In this paper,the perovskite film prepared by FAPbI_(3)single crystal has high crystallinity,high stability,accurate stoichiometric ratio and low defect density.The single crystal derived perovskite film has a large grain size and few grain boundaries,resulting in fewer defects in the grain boundaries,which improves the short-circuit current density(J_(SC))and open-circuit voltage(V_(OC))of perovskite solar cells,and greatly improves the photoelectric conversion efficiency.This work provides an efficient strategy for fabricating perovskite solar cells with high stability,high crystallinity,and low defect density.

关 键 词：单晶 钙钛矿太阳能电池 结晶度 缺陷密度 

分 类 号：TM914.4[电气工程—电力电子与电力传动]