Investigation of Open Air Stability of CsPbBr3 Thin-Film Growth on Different Substrates

Nicola Calisi,Stefano Caporali

doi:10.3390/app10217775

Abstract

Originally developed out of scientific curiosity, lead halide perovskites are rapidly gaining success due to their broad tenability and ease of fabrication. Despite these advantages and the considerable progress made in the efficiency of perovskite-based devices, the stability of such materials remains a challenge. In this research paper, the role of substrate materials on which thin films of perovskites were deposited was examined, highlighting their critical importance for atmosphere-induced degradation. Indeed, CsPbBr3 thin films sputtered on glass (soda lime and quartz) and indium tin oxide (ITO) resulted more stable, while those deposited on polycrystalline gold-coated glass were much more prone to degradation in a temperature- and moisture-controlled (43% relative humidity (RH)) atmosphere.

Highlights

Perovskites are a large family of chemically variable compounds structurally related to the mineral perovskite CaTiO3
The as-formed lead halide perovskites are subject to rapid degradation if exposed to moisture [11], ultraviolet (UV)
The aim of this work was to compare the stability of CsPbBr3 thin films deposited onto different substrates when exposed to a moisture- and temperature-controlled atmosphere

Summary

Introduction

Perovskites are a large family of chemically variable compounds structurally related to the mineral perovskite CaTiO3. X (e.g., CH3 NH3 PbBr3 ), hybrid perovskites have been proposed as innovative materials for many applications [3,4,5], especially related to solar energy conversion and the fabrication of diodes, lasers, light-emitting diodes (LEDs), and many others [5,6,7]. Their good capability of adsorbing light, long diffusion length of charge carriers, and tunable band gap, among others, are their main advantages with respect to traditional materials. The as-formed lead halide perovskites are subject to rapid degradation if exposed to moisture [11], ultraviolet (UV)

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