SnO₂-Ti₃C₂复合电子传输层用于高效且易制备的平面钙钛矿太阳能电池

In this work, the SnO2-Ti3C2 hybrid electron transport layer (ETL) was prepared by incorporating two-dimensional Ti3C2-MXene into SnO2 and appropriate ultraviolet (UV) ozone treatment. The synergistic effect of Ti3C2 introduction and UV ozone treatment on the charge transport capacity of SnO2 ETL, interface properties of ETL/perovskite, perovskite morphology, and device performance was systematically investigated. The results show that the introduction of Ti3C2 does not affect the morphology and transmittance of SnO2 ETL. The perovskite films based on SnO2-Ti3C2 are not only dense, but also have smaller surface roughness, more uniform, and larger grain size, even penetrating the entire perovskite film. The surface oxidation of Ti3C2 induced by UV-ozone treatment enhanced the charge transport capacity of ETL. The electron extraction and charge transfer at the interface between SnO2-Ti3C2 ETL and perovskite are higher, and carrier recombination is effectively suppressed. Perovskite solar cells (PSCs) based on SnO2-Ti3C2 ETL have larger charge recombination impedance and higher electron mobility, mainly due to enhanced ETL charge transport and optimization of interface properties. The short-circuit current (Jsc) and filling factor (FF) of PSCs are increased by 5% and 7% respectively, delivering a champion device with a relatively high FF of 79.38% and high power conversion efficiency of 19.52%, as well as good stability. Thus, this study provides a simple and effective method for the preparation of efficient and repeatable PSCs and paves the way for the industrialization of PSCs to a certain extent.