Tetrabutylammonium Hydroxide-Functionalized TiCT MXene for Significantly Improving the Photovoltaic Performance of Perovskite Solar Cells.

An appropriate electron transport layer (ETL) or cathode buffer layer (CBL) is critical for high-performance perovskite solar cells (PVSCs). In this work, tetrabutylammonium hydroxide (TBAOH)-functionalized TiCT MXene (TBAOH-TiCT) is developed to improve the photovoltaic performance of PVSCs. TBAOH-TiCT is synthesized by HF etching and then TBAOH intercalation, and TBAOH can effectively attach to the TiCT surface during the intercalation process.