Comparing Charge Dynamics in Organo-Inorganic Halide Perovskite: Solid-State vs Solid-Liquid Junctions

Abstract

Abstract The photoelectrochemical cell based on the perovskite-electrolyte solid-liquid junction has potential applications in electrolyte gated field effect transistors, photoelectrochemical and photocatalytic cells for water-splitting, supercapacitors, and CO2 capture and reduction devices. While hybrid perovskite materials face challenges due to their instability when in contact with aqueous electrolytes, there have been recent advancements in achieving stability of organo-inorganic halide perovskite films by utilizing specific liquid electrolyte solutions that involve the dissolution of tetrabutylammoniumperchlorate in dichloromethane. Currently, there is limited understanding of the differences in charge and ion kinetics at the perovskite/liquid electrolyte interface compared to the perovskite/solid charge transport layer interface. This study utilizes IMPS, OCVD, and C-F techniques to investigate and compare charge dynamics in perovskite/electrolyte-based and perovskite/solid devices. Additionally, the research explores the disparities between solid-liquid junctions and solid-state junctions, considering mobile ions, electric fields, and electron-hole transport. Furthermore, the study delves into changes in recombination resistance and the charging of the ionic double layer in perovskite-based devices, aiming to provide fundamental insights into the operation mechanisms of perovskite/liquid electrolyte devices and shed light on the underlying kinetics at the hybrid perovskite/electrolyte interface.