EDITORIAL: ADVANCES IN PEROVSKITE MATERIALS FOR OPTOELECTRONIC APPLICATIONS

Abstract

The class of halide perovskite materials has been widely used in optoelectronics. The application of halide perovskites in solar cells has made a significant breakthrough in the field of emerging photovoltaic (PV) technologies since the last decade. The power conversion efficiencies (PCEs) of perovskite based solar cells (PSCs) have shown a remarkable increase from the pioneering value of 3.8% in 2009 to the recent record of 25.5 and 29.5% for the single junction device and the tandem with silicon (Si) respectively. Beyond the field of PV, the three-dimensional halide perovskites and their low-dimensional counterparts have been also widely explored for applications in light emission. The metal halide perovskites are promising luminescent materials as they exhibit a high photoluminescence (PL) quantum yield reaching 100% as well as narrow and symmetric PL peaks which can be tunable all over the visible spectral range. In just a few years, the external quantum efficiencies of the green- and red-emitting devices have been enhanced over 20%. Despite the promising optoelectronic properties of this class of materials, a number of challenges such as material instability, short device lifetime, processing difficulties in preparation of perovskite materials in a large scale and on flexible substrates etc. have still not been completely solved before the stage of commercialization. Over the years, the community has devoted intensive attentions to investigating the properties of this class of materials as well as understanding their device physics and a lot of effective strategies for overcoming the aforementioned challenges have been demonstrated with very promising results. The Research Topic entitled Advances in Perovskite Materials for Optoelectronic Applications of Frontiers in Materials has a collection of 6 articles focused on discussing the recent development of halide perovskite-based materials for applications in solar cells and light emitting diodes...