SiW₁₂–TiO₂ Mesoporous Layer for Enhanced Electron‐Extraction Efficiency and Conductivity in Perovskite Solar Cells

Abstract

Abstract High quality electron‐transport layer (ETL) with superior optical and electrical properties is an essential part in high efficient perovskite solar cells (PSCs). In this work, SiW 12 –TiO 2 mesoporous film is prepared by a facile one‐step spin‐coating deposition method and successfully applied as ETL in PSCs. Compared with pristine TiO 2 ‐based PSC, the SiW 12 –TiO 2 ‐based one shows a remarkable enhanced power conversion efficiency (PCE) from 12.00 to 14.66 %, which is owed to the higher conductivity, electron‐extraction efficiency, and well‐matched energy level alignment of SiW 12 –TiO 2 film. Moreover, the SiW 12 –TiO 2 ‐based device also shows a good long‐time stability in under ambient conditions. This work demonstrates that using polyoxometalates (POMs) to modify the metal‐oxide semiconductors is an effective approach for further enhancing the performance of PSCs.