Heterostructure Design in Two-Dimensional Perovskites by Sequential Recrystallization

TL;DR

This paper presents a versatile one-pot synthesis method for creating diverse 2D perovskite heterostructures with high crystalline quality, enabling tailored optoelectronic properties for advanced device applications.

Contribution

It introduces a novel sequential crystallization approach for fabricating complex 2D perovskite heterostructures with multiple heterojunctions in a single process.

Findings

Successful fabrication of various heterostructures with crystalline quality

Multicolor emission and optical coupling achieved

Method enables design freedom for optoelectronic devices

Abstract

Low-dimensional metal halide perovskites provide exciting opportunities to fabricate new semiconductor materials. Semiconductor technology relies on electronic heterojunctions, and cost-efficient and flexible approaches to realize functional heterostructures are of fundamental importance. Lateral heterostructures define the energy landscape in the plane of the semiconducting lattice in such 2D materials, representing an ideal platform to tailor energy barriers and to control charge carrier flow. Here, we demonstrate a versatile one-pot synthesis to fabricate a large variety of 2D perovskite heterostructures based on different halides and/or metal cations. Exploiting sequential crystallization of different 2D perovskites, and playing with the composition and injection events of the materials, enables the design of diverse heterostructure architectures including multiple heterojunctions. We obtain crystalline quality of the heterojunctions, multicolor emission, and optical coupling between the different heterostructure regions. We foresee that the design freedom of our method will stimulate the development of novel optoelectronic devices where electronic band engineering is crucial.