Unveiling the nanoscale photocurrent behavior in perovskite films on photonic-structured TiO2

Abstract

Understanding charge carrier dynamics at the nanoscale is pivotal for advancing hybrid perovskite materials for optoelectronic applications. In this study, we investigate the nanoscale photocurrent behavior of perovskite films deposited on photonic-structured TiO₂, contrasting their performance with conventional mesoporous TiO₂ (mp TiO₂). By leveraging nanoscale photocurrent mapping, we reveal that photonic-structured TiO₂ fosters stable and sustained photocurrent generation, attributed to enhanced charge retention and suppressed recombination. In contrast, perovskite films on mp TiO₂ exhibit photocurrent degradation over time due to charge trapping and instability. These findings underscore the transformative role of photonic-structured TiO₂ in modulating charge carrier dynamics, advancing our understanding of perovskite material behavior. Our findings establish a new framework for correlating nanoscale photocurrent patterns with structural engineering in perovskite devices, paving the way for future innovations in material design.