Layered perovskite with compact morphology and reduced grain size via vacuum assisted crystallization for luminescence applications

Abstract

© 2020 Optical Society of America. Perovskite materials have gained a lot of interest in LED application because of their excellent properties, such as direct band gap nature, high photoluminescence quantum efficiency (PLQE), high charge carrier mobility, pure color emission with small full width at half maximum, and low non-radiative recombination rate. In this work, we for the first time, developed a new protocol called vacuum assisted crystallization (VAC) for perovskite luminescence applications and optimized different parameters i.e. vacuum pressure, holding time, and annealing time. VAC is an after-deposition process applicable to control nanoscale domain structure and improve phase distribution for various deposition techniques, causing small grain size and dense formation beneficial for high luminescence. Large PLQE enhancement, smooth bright emission, high stability, and good surface morphology were obtained with VAC treatment.