Origin of Luminescent Centers and Edge States in Low-Dimensional Lead Halide Perovskites:Controversies,Challenges and Instructive Approaches

论文摘要

With only a few deep-level defect states having a high formation energy and dominance of shallow carrier non-trapping defects,the defect-tolerant electronic and optical properties of lead halide perovskites have made them appealing materials for high-efficiency,low-cost,solar cells and light-emitting devices.As such,recent observations of apparently deep-level and highly luminescent states in low-dimensional perovskites have attracted enormous attention as well as intensive debates.The observed green emission in 2D CsPb2Br5 and 0 D Cs4PbBr6 poses an enigma over whether it is originated from intrinsic point defects or simply from highly luminescent CsPbBr3 nanocrystals embedded in the otherwise transparent wide band gap semiconductors.The nature of deep-level edge emission in 2D Ruddlesden–Popper perovskites is also not well understood.In this mini review,the experimental evidences that support the opposing interpretations are analyzed,and challenges and root causes forthe controversy are discussed.Shortcomings in the current density functional theory approaches to modeling of properties and intrinsic point defects in lead halide perovskites are also noted.Selected experimental approaches are suggested to better correlate property with structure of a material and help resolve the controversies.Understanding and identification of the origin of luminescent centers will help design and engineer perovskites for wide device applications.

论文目录

• HIGHLIGHTS
• 1 Introduction
• 2 Defects and Inclusions in Cs–Pb–Br System Rooted in the Ternary Phase Diagram
•   2.1 Luminescent State in 2D Wide Bandgap CsPb2Br5
•   2.2 Luminescent State in 0D Wide Bandgap Cs4PbBr6Perovskite
•   2.3 Bright Edge States in 2D Ruddlesden–Popper （R–P） Perovskites
• 3 Problems and Challenges in Revealingthe Origin of Luminescence Centers in Lead Halide Perovskites
• 4 Designing Combined ExperimentalCharacterization Approaches for Better Consistency

文章来源

类型: 期刊论文

作者: Jiming Bao,Viktor G.Hadjiev

来源: Nano-Micro Letters 2019年02期

年度: 2019

分类: 工程科技Ⅰ辑

专业: 无机化工

单位: Department of Electrical and Computer Engineering,University of Houston,Department of Chemistry,University of Houston,Materials Science and Engineering,University of Houston,Texas Center for Superconductivity,University of Houston,Department of Mechanical Engineering,University of Houston

基金: support from the Robert A.Welch Foundation(E-1728),National Science Foundation(EEC-1530753),supported by the State of Texas through the Texas Center for superconductivity at the University of Houston

分类号: TQ132.32

页码: 109-126

总页数: 18

文件大小: 1986K

下载量: 14