乙酸钾修饰界面用于高效稳定的钙钛矿太阳电池  

POTASSIUM ACETATE MODIFIED INTERFACE FOR EFFICIENTAND STABLE PEROVSKITE SOLAR CELLS

作　　者：户立文 胡隆生 杨亿凡 李国龙[1] Hu Liwen;Hu Longsheng;Yang Yifan;Li Guolong(School of Materials and New Energy,Ningxia University,Ningxia 750021,China;China Three Gorges Renewables(Group)Co.,Ltd.,Beijing 101100,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]宁夏大学材料与新能源学院,银川750021 [2]中国三峡新能源(集团)股份有限公司,北京101100 [3]石家庄铁道大学土木工程学院,石家庄050043

出　　处：《太阳能学报》2024年第4期51-58,共8页Acta Energiae Solaris Sinica

基　　金：基于石墨烯Fabry-Perrot腔结构的太赫兹光电探测器研发(2020BDE03013)。

摘　　要：使用乙酸钾(KAc)修饰电子传输层,正置结构的SnO_(2)/perovskite界面使用其具有的羧基和碱金属阳离子调节能级。研究发现,KAc薄膜的引入会对钙钛矿薄膜产生一定的表面陷阱钝化作用,表现出非辐射复合的减少以及体内和界面电荷复合的抑制。此外,调节钙钛矿晶体的生长,产生晶粒尺寸从450 nm增至600 nm且无针孔的钙钛矿薄膜,缺陷密度显著降低。结果表明,通过使用KAc来修饰电子传输层,可明显减少SnO_(2)电子传输层的缺陷及能级差;优化后的太阳电池效率提高7.63%,量子效率(IPCE)从87.3%增大到90.1%。In the paper,potassium acetate(KAc)is used to modify the SnO_(2) electron transport layer,thus regulating the energy level alignment of the SnO_(2)/perovskite interface.In addition,the introduction of KAc film passivates perovskite film to attenuate the probability of non-radiative recombination and inhibits the bulk and interface charge recombination.Meanwhile,the introduction of KAc film improves the growth process of perovskite crystals.Perovskite films with grain size increase from 450 nm to about 600 nm and without pinholes are produced.Therefore,inserting KAc as the modification layer significantly reduces the defect of the SnO_(2) electron transport layer and optimizes energy level difference as well.As a result,the efficiency of the optimized solar cell is increased by 7.63%compared with that of the referred device,and the IPCE is increased from 87.3%to 90.1%.

关 键 词：钙钛矿太阳电池 结晶度 缺陷密度 乙酸钾 

分 类 号：TM914.4[电气工程—电力电子与电力传动]