MXene Modulated Electrode/SnO2 Interface Boosting Charge Transport in Perovskite Solar Cells.
Interface engineering is imperative to boost the extraction capability in perovskite solar cells (PSCs) We propose a promising approach to enhance the electron mobility and charge transfer ability of tin oxide (SnO2) electron transport layer (ETL) by introducing a two dimensional carbide (MXene) with strong interface interaction. The MXene modified SnO2 ETL also offers a preferable growth platform for perovskite films with reduced trap density. Through a spatially resolved imaging technique, profoundly reduced non radiative recombination and charge transport losses in PSCs based on MXene modified SnO2 are also observed. As a result, the PSC achieves an enhanced efficiency of 20.65% with ultralow saturated current density and negligible hysteresis. We provide an in depth mechanistic understanding of MXene interface engineering, offering an alternative approach to obtain efficient PSCs.
ACS applied materials interfaces