Excitonic Properties of Chemically Synthesized 2D Organic-Inorganic Hybrid Perovskite Nanosheets
作者:Qi Zhang、Leiqiang Chu、Feng Zhou、Wei Ji、Goki Eda
DOI:10.1002/adma.201704055
日期:2018.5
2D organic–inorganic hybrid perovskites (OIHPs) represent a unique class of materials with a natural quantum‐well structure and quasi‐2D electronic properties. Here, a versatile direct solution‐based synthesis of mono‐ and few‐layer OIHP nanosheets and a systematic study of their electronic structure as a function of the number of monolayers by photoluminescence and absorption spectroscopy are reported
二维有机-无机杂化钙钛矿(OIHP)代表一类独特的材料,具有天然的量子阱结构和准2D电子性质。在这里,报道了一种基于直接溶液的多功能单层和多层OIHP纳米片的合成方法,并通过光致发光和吸收光谱系统研究了它们的电子结构与单层数的关系。发现各种OIHP的单层具有高电子质量,高量子产率和可忽略的斯托克斯位移证明了这一点。结果表明,当层厚度从体层减小到单层时,地面激子峰蓝移约40 meV。还表明,对于(C 6 H 5(CH 2),激子结合能实际上保持不变2 NH 3)2 PbI 4具有层数。与以前的报告相比,(C 4 H 9 NH 3)2 PbI 4观察到相似的趋势。此外,发现光致发光寿命随着单层数量的减少而减少,这表明表面陷阱态在电子-空穴对的非辐射复合中起着主导作用。