Passivation with crosslinkable diamine yields 0.1 V non-radiative Vloss in inverted perovskite solar cells  

利用可交联二胺分子钝化钙钛矿实现0.1V非辐射开路电压损耗

作　　者：Fang Wan Lili Ke Yongbo Yuan Liming Ding 万方;柯丽丽;袁永波;丁黎明(Hunan Key Laboratory of Super Microstructure and Ultrafast Process,School of Physics and Electronics,Central South University,Changsha 410083,China;Center for Excellence in Nanoscience(CAS),Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS),National Center for Nanoscience and Technology,Beijing 100190,China)

机构地区：[1]Hunan Key Laboratory of Super Microstructure and Ultrafast Process,School of Physics and Electronics,Central South University,Changsha 410083,China [2]Center for Excellence in Nanoscience(CAS),Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS),National Center for Nanoscience and Technology,Beijing 100190,China

出　　处：《Science Bulletin》2021年第5期417-420,M0003,共5页科学通报（英文版）

基　　金：Y.Yuan thanks the financial support from the National Natural Science Foundation of China(51673218)and the Innovation-Driven Project of Central South University(2020CX006);L.Ke thanks the financial support from the Natural Science Foundation of Hunan Province(2019JJ50776);L.Ding thanks the financial support from the National Key Research and Development Program of China(2017YFA0206600);the National Natural Science Foundation of China(51773045,21772030,51922032 and 21961160720).

摘　　要：Organic-inorganic hybrid perovskite solar cells(PSCs)have attracted continually increasing attention in recent years due to its outstanding photoelectric properties and bright commercial prospect[1–6].So far,the certified power conversion efficiency(PCE)record of PSCs increased up to be 25.2%[7].However,the efficiency for PSCs with inverted structure was generally lower(~22.3%)[8].A major reason for the relatively lower PCE in inverted solar cells was that the achieved open-circuit voltage(V_(oc))was generally lower than that of conventional PSCs based on the same photoactive layers[9–11].在倒置结构的钙钛矿太阳电池中,抑制非辐射复合导致的开路电压损失对进一步提升其光电性能十分重要.钙钛矿晶体的缺陷会产生深能级陷阱,导致非辐射复合.本文采用一种二胺分子乙二胺二氢碘化物(EDAI_(2))来钝化Cs_(0.05)FA_(x)MA_(0.95-x)PbI_(y)Br_(3-y)基倒置钙钛矿太阳电池. EDAI_(2)的一端胺基钝化了钙钛矿表面的A位缺陷,同时采用六亚甲基二异氰酸酯(HDI)交联EDAI_(2)的另一端胺基.通过EDAI_(2)/HDI钝化,钙钛矿太阳电池的非辐射复合被降低至0.10 V,达到倒置结构钙钛矿太阳电池开压损失的最低值.同时其开路电压由基础器件的1.10 V提升至1.17 V,能量转换效率由19.3%提升至21.2%.变光强下的J-V表征和瞬态光电压表征表明钝化后的器件拥有更长的载流子复合寿命.另外,由于EDAI_(2)分子的胺基的交联阻止了EDA分子向钙钛矿晶体内部的扩散, EDAI_(2)/HDI的钝化效果在85℃下表现出良好的耐受性.

关 键 词：钙钛矿太阳电池 开路电压 能量转换效率 非辐射复合 载流子复合 倒置结构 EDA 钝化 

分 类 号：TB34[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]