开尔文探针力显微镜(KPFM)在钙钛矿太阳电池研究中的应用  

Application of Kelvin probe force microscope(KPFM)in the research of perovskite solar cells

作　　者：向艳[1,2] 董卓凡 程诺 曹洋 邓韶鹏 母林川 张海川 Xiang Yan;Dong Zhuofan;Cheng Nuo;Cao Yang;Deng Shaopeng;Mu Linchuan;Zhang Haichuan(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;School of Photovoltaic New Energy Modern Industry,Southwest Petroleum University,Chengdu 610500,China;Tongwei Solar Energy(Chengdu)Co.,Ltd.,Chengdu 610200,China)

机构地区：[1]西南石油大学新能源与材料学院,成都610500 [2]西南石油大学光伏新能源现代产业学院,成都610500 [3]通威太阳能(成都)有限公司,成都610200

出　　处：《分析仪器》2024年第5期13-19,共7页Analytical Instrumentation

基　　金：四川省产教融合示范项目“四川省光伏产业产教融合综合示范基地”(川财教[2022]106号);西南石油大学开放实验基金(2022KSZ05006)。

摘　　要：开尔文探针力显微镜(KPFM)中文基于原子力显微镜的表征技术,常用来测试样品表面和探针之间的接触电势差(CPD)和样品功函数,被广泛应用于各种导电或半导体样品表面特性研究。本实验通过KPFM技术测试Pb I2溶液中不添加和添加正丁基碘化胺(BAI)制备的钙钛矿薄膜形貌和功函数,并结合钙钛矿薄膜的X射线衍射谱和紫外可见吸收光谱,分析正丁胺阳离子(BA^(+))对钙钛矿结晶、载流子传输和器件性能的影响。研究发现,在两步法制备钙钛矿薄膜过程中第一步Pb I2前驱体溶液中引入离子半径较大的间隔阳离子BA^(+),使形成的Pb I2薄膜晶粒和分布更均匀,促进钙钛矿结晶和晶界缺陷钝化,可以提升电池性能。Based on atomic force microscopy characterization technique,Kelvin probe force microscopy(KPFM)is commonly used to measure the contact potential difference(CPD)and work function between the sample surface and the probe,and also widely used in the study of surface characteristics of various conductive or semiconductor samples.In this work,KPFM technology was used to analysis the morphology and work function of perovskite films respectively prepared without and with 1-butylamine iodide(BAI)in PbI2 solution.The effects of 1-butylamine cation(BA^(+))on perovskite crystallization,carrier transport and device performance were analyzed by KPFM combined with the X-ray diffraction spectra and UV-visible absorption spectra of perovskite films.The results showed that a spacer cation with a large ionic radius(BA^(+))introduced into the PbI2 precursor solution at the first step of the process of preparing perovskite films could make more uniform in both the grain size and distribution in the formed PbI2 films,leading to promotion of the crystallization quality of perovskite and the passivation of grain boundary defects as well as improvement of the cell performance.

关 键 词：开尔文探针力显微镜 钙钛矿太阳电池 表面电势差 BAI 钝化 

分 类 号：TM914.4[电气工程—电力电子与电力传动]