Oriented inorganic perovskite absorbers processed by colloidal-phase fumigation  

溶胶态熏蒸处理制备取向规整的无机钙钛矿吸光层薄膜

作　　者：Ziren Zhou Hong Wei Qiao Xiaolong Li Chen Lin Jin Xie Yiheng Shi Zeqing Lin Bing Ge Mengjiong Chen Yi Zheng Jin Shuang Yang Yu Hou Hua Gui Yang 周资人;乔红伟;李晓龙;林晨;谢瑾;施以恒;林泽青;葛兵;陈锰炯;金一正;杨双;侯宇;杨化桂(Key Laboratory for Ultrafine Materials of Ministry of Education,Shanghai Engineering Research Center of Hierarchical Nanomaterials,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China;Shanghai Synchrotron Radiation Facility,Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201204,China;Department of Chemistry,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]Key Laboratory for Ultrafine Materials of Ministry of Education,Shanghai Engineering Research Center of Hierarchical Nanomaterials,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China [2]Shanghai Synchrotron Radiation Facility,Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201204,China [3]Department of Chemistry,Zhejiang University,Hangzhou 310058,China

出　　处：《Science China Materials》2021年第10期2421-2429,共9页中国科学（材料科学（英文版）

基　　金：financially supported by the National Ten Thousand Talent Program for Young Top-notch Talent;the National Natural Science Fund for Excellent Young Scholars (52022030);the National Natural Science Fund for Distinguished Young Scholars (51725201);the National Natural Science Foundation of China (51972111 and 51902185);the International (Regional) Cooperation and Exchange Projects of the National Natural Science Foundation of China (51920105003);the Innovation Program of Shanghai Municipal Education Commission (E00014);the Fundamental Research Funds for the Central Universities (JKD012016025 and JKD012016022);Shanghai Engineering Research Center of Hierarchical Nanomaterials (18DZ2252400)

摘　　要：Inorganic perovskite absorbers are promising candidates for next-generation photovoltaics due to their good thermal and light stabilities.Halide-mixed Cs Pb I_(x)Br_(3-x)reach a compromise between its structural tolerance and absorption edge,yet the power conversion efficiencies(PCEs)of the asfabricated cells can be considerably limited by the nonideal quality of solution-processed films.Here we demonstrated a fumigation strategy on colloidal perovskite films using dualO-donor ethyl acetate(EA).By in-situ monitoring this stage with grazing-incidence wide-angle X-ray scattering technology,we reveal that EA fumigation would impose ripening barrier on colloidal inorganic perovskites and hence slow down the nucleation rate,leading to an intermediate state for processing high-crystallinity and oriented perovskite films with improved photophysical properties.An optimized PCE of 16.6%was finally yielded upon wide-bandgap(1.9 eV)perovskite absorber.全无机钙钛矿卤化物拥有优良的光、热稳定性,被认为是颇具潜力的新一代光伏材料.Cs Pb I_(x)Br_(3-x)作为一种卤素混合的钙钛矿成分在结构容忍性和光吸收带边两者之间取得了平衡,然而其通过溶液加工获得的吸光层薄膜结晶质量通常情况下不够理想,使得无机钙钛矿太阳能电池的光电转换效率受到限制.本论文提出了一种基于无机钙钛矿薄膜的结晶调控手段,即利用双氧供体的乙酸乙酯蒸汽熏蒸处理溶胶态无机钙钛矿前驱体薄膜.通过广角掠入射X射线散射谱原位表征,我们发现该熏蒸处理手段能够抑制溶胶态钙钛矿的熟化,从而降低钙钛矿的形核速度.高温退火后的钙钛矿薄膜获得了较高的结晶度和规整的晶体取向,并表现出良好的光电特性,基于此制备的宽带隙(1.9 eV)无机钙钛矿太阳能电池取得了16.6%的光电转换效率.

关 键 词：cesium lead halide perovskite FUMIGATION orientation photophysical properties solar cells 

分 类 号：TM914.4[电气工程—电力电子与电力传动] TB383.2[一般工业技术—材料科学与工程]