Quantum confinement effect of two-dimensional all-inorganic halide perovskites  

全无机卤素钙钛矿中的量子限域效应（英文）

作　　者：蔡波 李晓明 顾宇 Moussab Harb 李建海 谢美秋 曹菲 宋继中 张胜利 Luigi Cavallo 曾海波 

机构地区：[1]MIIT Key Laboratory of Advanced Display Materials and Devices,Institute of Optoelectronics & Nanomaterials,College of Materials Science and Engineering,Nanjing University of Science and Technology [2]King Abdullah University of Science and Technology (KAUST),KAUST Catalysis Center (KCC),Physical Sciences and Engineering Division (PSE)

出　　处：《Science China Materials》2017年第9期811-818,共8页中国科学（材料科学（英文版）

基　　金：supported by the National Basic Research Program of China (2014CB931702);the National Key Research and Development Program of China (2016YFB0401701);the National Natural Science Foundation of China (NSFC 51572128 and 21403109);NSFC-RGC (5151101197);the Natural Science Foundation of Jiangsu Province (BK20160827);China Postdoctoral Science Foundation (2016M590455);the Fundamental Research Funds for the Central Universities (30915012205 and 30916015106);the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

摘　　要：Quantum confinement effect（QCE）, an essential physical phenomenon of semiconductors when the size becomes comparable to the exciton Bohr radius, typically results in quite different physical properties of low-dimensional materials from their bulk counterparts and can be exploited to enhance the device performance in various optoelectronic applications. Here, taking Cs Pb Br3 as an example, we reported QCE in all-inorganic halide perovskite in two-dimensional（2D） nanoplates. Blue shifts in optical absorption and photoluminescence spectra were found to be stronger in thinner nanoplates than that in thicker nanoplates, whose thickness lowered below -7 nm. The exciton binding energy results showed similar trend as that obtained for the optical absorption and photoluminescence. Meanwile, the function of integrated intensity and full width at half maximum and temperature also showed similar results, further supporting our conclusions. The results displayed the QCE in all-inorganic halide perovskite nanoplates and helped to design the all-inorganic halide perovskites with desired optical properties.当半导体材料尺寸缩小到与激子尺寸相当时,量子限域效应会在对应的低维材料中诱导出不同的物理行为.本文以CsPbBr_3为例,报道了在全无机钙钛矿纳米片中的量子限域效应.根据DFT理论模拟可知,当CsPbBr_3材料减薄至7纳米左右时,该效应导致该材料的光吸收和光致发光光谱的峰位蓝移,且样品越薄,峰位蓝移现象越明显.该效应也会导致激子束缚能随着材料厚度的减薄而显著增大.同时,变温光致发光光谱的光强-温度与半高宽-温度函数都显示出厚度越薄量子限域效应越强的趋势.本文揭示了二维全无机卤化物钙钛矿的量子限域效应,可为设计全无机卤化物钙钛矿光电器件提供参考依据.

关 键 词：quantum confinement effect all-inorganic halide perovskites NANOPLATES temperature dependence luminescence 

分 类 号：O413[理学—理论物理] TB383.1[理学—物理]