Perovskite Multiple Quantum Well Superlattices: Potentials and Challenges

Abstract

The rapid advancement of metal halide perovskites has sparked interest in strategies for manipulating their optoelectronic characteristics. In the ambit of group III−V materials, multiple quantum well (MQW) superlattices have previously demonstrated unique and advantageous photophysical properties, driving record efficiencies in both photovoltaic and light emission devices. Recently, perovskitebased MQWs have become feasible, owing to significant progress in physical vapor deposition techniques. In this Perspective, we outline the desirable optoelectronic traits of MQWs, some observed in established semiconductors and the few examples of perovskite-based ones. We elucidate the associated advantages and explore their potential prospects. Finally, we discuss some potential challenges that may be encountered in the pursuit of seamless integration of perovskite MQWs into efficient devices.

Charge Transfer in 2D Halide Perovskites and 2D/3D Heterostructures

“…In a type-II structure, either the HOMO and LUMO are both shallower than the VBM and CBM (referred to as type-II V ) or both deeper (referred to as type-II C ) (Figure B) . In both configurations, electrons and holes flow in different directions, resulting in a net charge transfer, which can significantly quench the florescence.…”

Laser Deposition of Metal Halide Perovskites

“…Moreover, the fact that several of the MHP applications require RT deposition and polycrystalline films facilitates the up-scaling and throughput of the process as compared to the use of PLD for high-temperature perovskite oxide films. Cost, throughput, and deposition rate will be decisive criteria to consider PLD or any other form of laser-based deposition for the fabrication of MHP for PV or for more specialized optoelectronic applications such integrated photonics, superlattices for efficient LEDs, and more …”