Light-controlled multi-phase structuring of perovskite crystal enabled by thermoplasmonic metasurface

TL;DR

This paper demonstrates a method to dynamically control multi-phase structuring in a single perovskite crystal using a thermoplasmonic metasurface, enabling tailored electronic and optical properties for advanced applications.

Contribution

It introduces a novel approach to induce controlled multi-phase structures in perovskites via thermoplasmonic metasurfaces, expanding possibilities for tunable optoelectronic devices.

Findings

Multi-phase structures can be formed on demand above room temperature.

The method enables single, double, and triple phase structures.

Enhanced optical and electronic properties are achieved through phase control.

Abstract

Halide perovskites belong to an important family of semiconducting materials with unique electronic properties that enable a myriad of applications, especially in photovoltaics and optoelectronics. Their optical properties, including photoluminescence quantum yield, are affected and notably enhanced at crystal imperfections where the symmetry is broken and the density of states increases. These lattice distortions can be introduced through structural phase transitions, allowing charge gradients to appear near the interfaces between phase structures. In this work, we demonstrate controlled multi-phase structuring in a single perovskite crystal. The concept uses cesium lead bromine (CsPbBr3) placed on a thermoplasmonic TiN/Si metasurface and enables single, double and triple phase structures to form on demand above the room temperature. This approach opens up application horizons of dynamically controlled heterostructures with distinctive electronic and enhanced optical properties.