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

ACS Nano
Enzheng ShiLetian Dou

Abstract

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 perovskites are extrinsic and can be triggered by moisture with a concentration as low as ∼0.5 ppm. High-resolution atomic force microscopy and transmission electron microscopy characterizations reveal the width of the low-energy states is ∼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 cm2 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.

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Citations

Jul 16, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Xun ZhangYi Yu
Jun 24, 2020·Reports on Progress in Physics·Chintam HanmandluChih-Wei Chu
Jun 25, 2019·Advanced Materials·Chong WangJiming Bao
Jun 5, 2021·Accounts of Chemical Research·Jovana V MilićMichael Grätzel
Jan 7, 2020·ACS Applied Materials & Interfaces·Xiaoli ZhangZhaoyu Zhang
Apr 18, 2020·Journal of the American Chemical Society·Mengyu GaoPeidong Yang
Dec 12, 2020·The Journal of Physical Chemistry Letters·Adedayo M Sanni, Aaron S Rury
Jun 28, 2019·The Journal of Physical Chemistry Letters·Chunyi ZhaoShengye Jin
Mar 25, 2021·Journal of the American Chemical Society·Chris R RoySong Jin
Nov 4, 2021·Journal of the American Chemical Society·Qi SunShengye Jin

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