28.3: Stabilization of photoluminescence perovskite nanocrystals via atomic layer deposition and the process influences

Abstract

We report the effects of low temperature atomic layer deposition (ALD) environment treatment on the photoluminescence properties and stability of perovskite quantum dot films. Compared with conventional chemical centrifugation, the loss of photoluminscence can be reduced by physical pressure and temperature control. The photoluminescence properties and long‐term stability of the films can be improved by vacuum heating and washing with weak polar solvents to reduce the content of organic matter on the surface. It also suggests that the colloidal environment of organic solvent and the air environment of device structure should be separated to explain the mechanism of stability during the preparation of QDs films by solution method. Besides, it provides a vision for further interpretation of the luminescence properties of quantum dot thin film materials by using ALD to accurately control the atmosphere, temperature and pressure.