CsSnBr_(3)钙钛矿微晶体的化学气相沉淀生长、结构、稳定性及光学性能的系统研究  

Systematic Study on CsSnBr_(3) Perovskite Microcrystals:Chemical Vapor Deposition Growth,Structure,Stability and Optical Properties

作　　者：何婷 董纳 姚一 徐法强[1] Ting He;Na Dong;Yi Yao;Faqiang Xu(National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China)

机构地区：[1]中国科学技术大学国家同步辐射实验室,合肥230029

出　　处：《Chinese Journal of Chemical Physics》2023年第4期477-485,I0036,共10页化学物理学报（英文）

基　　金：supported by the National Natural Science Foundation of China(No.11575187).

摘　　要：尽管铅基卤化物钙钛矿在光电器件中的应用前景广阔,但这些应用严格受限于材料的毒性,因此有必要开发无铅的全无机替代物,锡基卤化物钙钛矿虽然在可控合成和稳定性方面存在巨大挑战,但依然是理想的选择之一,本文利用化学气相沉积法进行了高质量的CsSnBr_(3)微晶体在SiO_(2)/Si表面的可控生长.制备的新鲜产物主要呈现三角星和钉状棒两种形貌,二者均具有立方相结构,产物在空气中暴露后有SnO_(2)生成,表明CsSnBra_(3)钙钛矿具有结构不稳定性,通过调变生长温度实现了对CsSnBr_(3)微晶体的成核密度及尺寸的控制.变功率和变温的光致发光结果表明,不同形貌的CsSnBr_(3)微晶体具有不同的激子结合能,而且由于量子限域效应对电子-空穴相互作用的影响而产生了不同的光激发物种。Although lead-based halide perovskites have promising applications in optoelectronic devices,these applications are limited by the toxicity of the materials.Therefore,it is necessary to develop leadfree all-inorganic substitute such as tinbased halide perovskites in spite of the enormous challenges in their controllable synthesis and stability.Here,we report the controlled growth of high quality CsSnBr_(3) microcrystals on SiO_(2)/Si substrates by chemical vapor deposition method.The as-prepared products predominantly show the morphology of triangle star and nail-like rod and the structure of cubic phase.The control of nucleation density and size of CsSnBr_(3) microcrystals has been realized by varying the growth temperature.The results of air-exposed samples explain the structural instability of the tin-based perovskites due to the production of SnO.The power and temperature dependent photoluminescence spectra reveal that CsSnBr_(3) microcrystals with different morphologies possess diferent exciton binding energies and produce different photoexcitation species due to the quantum confinement effect that changes the electron-hole effect.

关 键 词：化学气相沉积 CsSnBr_(3)微晶体 稳定性 光致发光 光激发物种 

分 类 号：O657.3[理学—分析化学] O73[理学—化学]