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Probing the Mechanism of Anion Exchange in Cesium Lead HalidePerovskites via gas cell TEM


EMSL Project ID
51291

Abstract

Using a combination of high-resolution and in situ TEM techniques, this work aims to develop an atomic-scale mechanistic understanding of anion exchange reactions and dopant migration in cesium lead halide perovskite nanocrystals. It will test the hypothesis that dopant aggregation into separate domains nucleates the new phase and drives the exchange process. Because perovskite nanocrystals are known to be electron beam-sensitive,1 low-dose techniques2 will be employed to achieve the necessary resolution. This work proposes to combine (i) advanced gas-cell TEM resources with (ii) EMSL high-resolution ETEM and STEM capabilities. High-resolution gas-phase environmental TEM will allow real-time observation, providing information on the dynamics of the nanocrystals and their constituent atoms during gas-phase exchange. Extensive controls will be employed to separate electron beam effects from ion exchange effects.

Project Details

Start Date
2020-02-19
End Date
2021-03-31
Status
Closed

Team

Principal Investigator

James De Yoreo
Institution
Pacific Northwest National Laboratory

Team Members

Kyle Kluherz
Institution
University of Washington

Amnon Ortoll-Bloch
Institution
Cornell University

Related Publications

Michael C. De Siena, Sidney E. Creutz, Annie Regan, Paul Malinowski, Qianni Jiang, Kyle T. Kluherz, Guomin Zhu, Zhong Lin, James J. De Yoreo, Xiaodong Xu, Jiun-Haw Chu, Daniel R. Gamelin. 2020. "Two-Dimensional van der Waals Nanoplatelets with Robust Ferromagnetism." Nano Letters 20 (3):2100-2106. 10.1021/acs.nanolett.0c00102