Two-Dimensional Ti3C2Tx-Patched-GO heterojunctionas charge booster and defect passivator for Stable, Carbon-Based inorganic perovskite solar cell
Xuemei Yao, Ziting Qi, Peizhi Yang, Jiabao Li, Wen Yang
Abstract
Simultaneously manipulating the interfacial energetics to boost charge extraction and passivate defective nanostructure to suppress unwanted non-radiative recombination is of great importance to increase the power conversion efficiency and long-term stability of carbon-based perovskite solar cells (C-PSCs), which requires rational design of interfacial regulator. Herein, a novel two-dimensional (2D) Ti3C2Tx MXene patched graphene oxide (GO) heterojunction is fabricated as perovskite film plaster to improve the overall photovoltaic performance of C-PSCs. Arising from the nucleophilic substitution and dehydration reaction between MXene (Ti-O-) and GO (-C = OH+), the negative-charge-centered GO induced by the oxygen-containing functional groups is healed. As a result, this heterojunction not only aligns the perovskite/carbon energy-level and provides a channel for carrier transport, but also effectively solidifies the soft perovskite lattice, universally promoting the efficiencies up to 11.07% for inorganic CsPbIBr2 C-PSC and 15.04% for CsPbI2Br C-PSC with significantly improved stability.