氯化铷添加剂对钙钛矿太阳能电池性能的影响  

Effects of RbCl additive on performance of perovskite solar cells

作　　者：高宇[1] 张衍国[1] 周会[1] 李清海[1] GAO Yu;ZHANG Yanguo;ZHOU Hui;LI Qinghai(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Department of Energy and Power Engineering,Beijing 100084,China)

机构地区：[1]清华大学能源与动力工程系,热科学与动力工程教育部重点实验室,北京100084

出　　处：《清华大学学报（自然科学版）》2024年第5期879-888,共10页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金项目(52070116);清华大学山西清洁能源研究院种子基金项目。

摘　　要：在钙钛矿前驱体溶液中加入添加剂,是改善钙钛矿薄膜质量、提高钙钛矿太阳能电池性能的重要手段。该研究采用氯化铷(RbCl)作为添加剂,通过扫描电子显微图像、 X射线衍射图谱、光致发光光谱等表征手段,研究了不同比例添加RbCl对钙钛矿薄膜形貌与结构的影响,并通过外量子效率测试等方法,比较了不同比例RbCl添加后的钙钛矿太阳能电池器件性能。结果表明:RbCl的添加有利于引导钙钛矿晶粒生长,增大晶粒尺度,形成致密薄膜,从而抑制界面处载流子复合。适量添加RbCl后,钙钛矿太阳能电池的光电转化效率从18.88%提升到20.06%,开路电压、短路电流密度和填充因子等参数均显著提高,钙钛矿太阳能电池性能得到明显改善。[Objective]Perovskite solar cells have drawn considerable attention in recent years.The addition of additives to perovskite precursor solutions is an important method to improve the quality of perovskite films for enhancing the performance of perovskite solar cells.In the past,alkali metal ions were extensively used as additives.Rubidium ions(Rb+)were generally added into perovskite films alongside other kinds of cations,following which the photovoltaic performance of the solar cells was clearly improved.However,few researchers studied the effects of only adding various proportions of Rb+on perovskite films.In this study,rubidium chloride(RbCl)was used as an additive in perovskite precursor solutions and the morphology and structure of perovskite films were analyzed.Perovskite films were fabricated using a two-step method.RbCl was used as an additive into lead(II)iodide(PbI2)precursor solutions with the RbCl proportions 2%,4%,6%,8%,10%,and 12%versus PbI2,and a PbI2 precursor solution with no RbCl added was used as the control.Scanning electron microscopy(SEM),energy-dispersive spectroscopy(EDS),and X-ray diffraction(XRD)analysis were employed to analyze the difference in surface morphology and structure of the perovskite films.Steady-state photoluminescence(SSPL)and time-resolved photoluminescence(TRPL)spectra were recorded using devices of fluorine-doped tin oxide(FTO)/SnO2/perovskite films to study the carrier-transporting properties.The photovoltaic performances of the perovskite solar cells were studied through a solar simulator and external quantum efficiency testing.UV-visible(UV-vis)absorption spectra were recorded to explore the change in light absorption.The crystalline grain size is clearly enhanced upon adding 4%RbCl.The grain size is 1.61μm in the control and 2.14μm upon adding 4%RbCl.However,a high addition proportion(>8%)damages and distorts the crystal structure,decreasing the film quality.Adding RbCl at a low proportion is beneficial for guiding the growth of perovskite grains,increasing grain s

关 键 词：钙钛矿太阳能电池 氯化铷 添加剂 钙钛矿薄膜 晶粒尺寸 

分 类 号：TM914.4[电气工程—电力电子与电力传动]