Quantitative imaging of anion exchange kinetics in halide perovskites

Ion exchange, as a postsynthetic transformation strategy, offers more flexibilities in controlling material compositions and structures beyond direct synthetic methodology. Observation of such transformation kinetics on the single-particle level with rich spatial and spectroscopic information has ne...

Full description

Saved in:
Bibliographic Details
Published in:Proceedings of the National Academy of Sciences - PNAS 2019-06, Vol.116 (26), p.12648-12653
Main Authors: Zhang, Ye, Lu, Dylan, Gao, Mengyu, Lai, Minliang, Lin, Jia, Lei, Teng, Lin, Zhenni, Quan, Li Na, Yang, Peidong
Format: Article
Language:English
Subjects:
2D heterostructures
Anion exchange
anion exchange and diffusion
Anion exchanging
Benzofurans - chemistry
Crystal structure
Diffusion
Diffusion coefficient
Electronics industry
halide perovskites
Halogens - chemistry
Heterostructures
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Ion exchange
Kinetics
Light
Luminescence
Microscopy
Nanostructures - chemistry
Nanostructures - radiation effects
Perovskites
Photoluminescence
Photons
Physical Sciences
Plates (structural members)
quantitative imaging
Reaction kinetics
Reaction time
Semiconductors
Single crystals
Single Molecule Imaging
Solar Energy
Time dependence
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Ion exchange, as a postsynthetic transformation strategy, offers more flexibilities in controlling material compositions and structures beyond direct synthetic methodology. Observation of such transformation kinetics on the single-particle level with rich spatial and spectroscopic information has never been achieved. We report the quantitative imaging of anion exchange kinetics in individual single-crystalline halide perovskite nanoplates using confocal photoluminescence microscopy. We have systematically observed a symmetrical anion exchange pathway on the nanoplates with dependence on reaction time and plate thickness, which is governed by the crystal structure and the diffusion-limited transformation mechanism. Based on a reaction–diffusion model, the halide diffusion coefficient was estimated to be on the order of 10−14cm² · s−1. This diffusion-controlled mechanism leads to the formation of 2D perovskite heterostructures with spatially resolved coherent interface through the precisely controlled anion exchange reaction, offering a design protocol for tailoring functionalities of semiconductors at the nano-/microscale.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.1903448116