Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.251
Publication date: 18th July 2023
Metal-halide perovskites (MHPs) are a type of materials that have the potential to greatly impact optoelectronic devices. A significant material’s science challenge has been the presence of electronic trap states, which are difficult to characterize and mitigate. Various attempts have been made to use electronic spectroscopies to study the defect states in bulk crystals of MHPs. However, due to the mixed nature of electronic and ionic conductivity in MHPs, the results of these experiments often have a high level of uncertainty in distinguishing between electronic and ionic charge contributions.
In this study, we employ a method called photo-induced current transient spectroscopy (PICTS), which was previously used in highly resistive inorganic semiconductors, to analyze single crystals of two types of MHPs: lead bromide 2D-like ((PEA)2PbBr4) and standard "3D" (MAPbBr3) perovskites. By applying PICTS, we are able to obtain two distinct outcomes that allow us to differentiate between the electronic and ionic contributions to the photocurrents. This differentiation is based on the ion mobility of the two different materials. Our experimental findings reveal the presence of deep level trap states in the 2D perovskite ((PEA)2PbBr4), which has limited ion mobility. Furthermore, our results establish new boundaries for the use of PICTS in studying 3D perovskites, which exhibit greater ionic diffusion.
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