Extrinsic and Dynamic Edge States of Two-Dimensional Lead Halide Perovskites

doi:10.1021/acsnano.8b07631

	Extrinsic and Dynamic Edge States of Two-Dimensional Lead Halide Perovskites
	Shi, Enzheng 1; Deng, Shibin 2; Yuan, Biao3 ; Gao, Yao 1; Akriti 1; Yuan, Long 2; Davis, Chelsea S.4; Zemlyanov, Dmitry 5; Yu, Yi3 ; Huang, Libai 2; Dou, Letian 1
	2019-02
发表期刊	ACS NANO
ISSN	1936-0851
卷号	13 期号:2 页码:1635-1644
发表状态	已发表
DOI	10.1021/acsnano.8b07631
摘要	Edges of two-dimensional (2D) halide perovskites are found to exhibit unusual properties such as enhanced photoluminescence lifetime and reduced photoluminescence emission energy. Here, we report the formation mechanism and the dynamic nature of edge states on exfoliated 2D halide perovskite thin crystals. In contrast to other 2D materials, the edge states in 2D perovskitis are extrinsic and can be triggered by moisture with a concentration as low as similar to 0.5 ppm. High-resolution atomic force microscopy and transmission electron microscopy characterizations reveal the width of the low-energy states is similar to 40 nm wide. A temperature-dependent photoluminescence study suggests the edge states are a combination of several lower-energy states. Importantly, we demonstrate that the charge carriers on the dynamically formed edge states are not only long-lived but also highly mobile and can be conducted along the edges effectively with high mobilities of 5.4-7.0 cm(2) V-1 s(-1). This work provides significant insights on the origin of the edge states in 2D perovskites and provides routes to manipulate their optical and electrical properties through controlling their edges.
关键词	two-dimensional perovskites edge states moisture energy transfer carrier mobility
收录类别	SCI ; SCIE ; EI
语种	英语
资助项目	National Science Foundation through the Major Research Instrumentation Program[CHE 1625543]
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
WOS类目	Chemistry, Multidisciplinary ; Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS记录号	WOS:000460199400064
出版者	AMER CHEMICAL SOC
WOS关键词	SITES ; NANOSHEETS ; STABILITY ; EVOLUTION ; EMISSION
原始文献类型	Article
引用统计
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/30560
专题	物质科学与技术学院_PI研究组_于奕组物质科学与技术学院_硕士生物质科学与技术学院_博士生
通讯作者	Dou, Letian
作者单位	1.Purdue Univ, Davidson Sch Chem Engn, W Lafayette, IN 47907 USA 2.Purdue Univ, Dept Chem, W Lafayette, IN 47907 USA 3.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 4.Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 USA 5.Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA
推荐引用方式 GB/T 7714	Shi, Enzheng,Deng, Shibin,Yuan, Biao,et al. Extrinsic and Dynamic Edge States of Two-Dimensional Lead Halide Perovskites[J]. ACS NANO,2019,13(2):1635-1644.
APA	Shi, Enzheng.,Deng, Shibin.,Yuan, Biao.,Gao, Yao.,Akriti.,...&Dou, Letian.(2019).Extrinsic and Dynamic Edge States of Two-Dimensional Lead Halide Perovskites.ACS NANO,13(2),1635-1644.
MLA	Shi, Enzheng,et al."Extrinsic and Dynamic Edge States of Two-Dimensional Lead Halide Perovskites".ACS NANO 13.2(2019):1635-1644.