Shape‐Controlled Solution‐Epitaxial Perovskite Micro‐Crystal Lasers Rivaling Vapor Deposited Ones

Language
en
Document Type
Article
Issue Date
2022-11-24
First published
2022-11-03
Issue Year
2022
Authors
Afify, Hany A.
Rehm, Viktor
Barabash, Anastasiia
These, Albert
Zhang, Jiyun
Osvet, Andres
Schüßlbauer, Christoph
Thiel, Dominik
Ullrich, Tobias
Dierner, Martin
Editor
Abstract

Abstract Epitaxial growth methods usually need dedicated equipment, high energy consumption to maintain pure vacuum conditions and evaporation of source materials, and elevated substrate temperatures. Solution epitaxial growth requires nothing of that but is rarely used because the achieved microstructures are of low quality, not homogeneous, and finally exhibit worse performances in devices. Here, an antisolvent‐vapor‐assisted‐crystallization of metal‐halide‐perovskites as a method overcoming these disadvantages is demonstrated. The methylammonium lead tribromide exhibits van‐der‐Waals type of epitaxial growth on mica substrates, resulting in micro‐crystallites whose shape can be controlled to be either triangular micro‐prism or micro‐cuboid. These micro‐crystallites act as optical resonators supporting various optical modes and lasing is achieved under optical excitation with low thresholds and record high environmental stability. Selecting suitable resonators from a large variety of sizes allows control of mode spacing and finally mono‐mode operation, considered to be an important feature of semiconductor laser devices. The achieved results are essentially competitive to those obtained by vapor phase epitaxial microstructures, highlighting that epitaxy of high‐quality optoelectronic device structures is feasible by minimum technological efforts and energy consumption, which are of increasing importance considering issues such as global warming and the current energy crisis.

Journal Title
Advanced Functional Materials
Volume
32
Issue
45
Citation
Advanced Functional Materials 32.45 (2022): 2206790. <https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.202206790>