Quantum confinement effect and exciton binding energy of layered perovskite nanoplatelets

被引：62

作者：

Wang, Qiang ^{[1
]}

Liu, Xiao-Dan ^{[1
]}

Qiu, Yun-Hang ^{[1
]}

Chen, Kai ^{[1
]}

Zhou, Li ^{[1
]}

Wang, Qu-Quan ^{[1
,2
]}

机构：

[1] Wuhan Univ, Sch Phys & Technol, Minist Educ, Key Lab Artificial Micro & Nanostruct, Wuhan 430072, Hubei, Peoples R China

[2] Wuhan Univ, Inst Adv Studies, Wuhan 430072, Hubei, Peoples R China

来源：

AIP ADVANCES | 2018年 / 8卷 / 02期

基金：

中国国家自然科学基金;

关键词：

ORGANOMETAL HALIDE PEROVSKITE; CESIUM LEAD HALIDE; LIGHT-EMITTING-DIODES; SOLAR-CELLS; COLLOIDAL NANOCRYSTALS; BROMIDE PEROVSKITES; OPTICAL-PROPERTIES; ROOM-TEMPERATURE; THIN-FILMS; LUMINESCENT;

D O I：

10.1063/1.5020836

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We report the preparation of monolayer (n = 1), few-layer (n = 2-5) and 3D (n = infinity) organic lead bromide perovskite nanoplatelets (NPLs) by tuning the molar ratio of methylammonium bromide (MABr) and hexadecammonium bromide (HABr). The absorption spectrum of the monolayer (HA)(2)PbBr4 perovskite NPLs shows about 138 nm blue shift from that of 3D MAPbBr(3) perovskites, which is attributed to strong quantum confinement effect. We further investigate the two-photon photoluminescence (PL) of the NPLs and measure the exciton binding energy of monolayer perovskite NPLs using linear absorption and two-photon PL excitation spectroscopy. The exciton binding energy of monolayer perovskite NPLs is about 218 meV, which is far larger than tens of meV in 3D lead halide perovskites. (c) 2018 Author(s).

引用

页数：8

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