TiO<sub>2</sub> Mesocrystals Processed at Low Temperature as the Electron‐Transport Material in Perovskite Solar Cells
Minghuang Guo, Deli Shen, Yafeng Li, Muhammad Aftab Akram, Mingdeng Wei
Abstract
Abstract TiO 2 is the most widely used material for preparing the electron‐transporting layer (ETL) in perovskite solar cells (PSCs). However, it requires a high‐temperature sintering process. Moreover, the intrinsic defects and low electron mobility of TiO 2 ETLs cause instability and hysteresis effects in PSCs. In this study, a mesoporous film composed of anatase TiO 2 mesocrystals was facilely fabricated by a low‐temperature route and then used as an ETL in PSCs for the first time. A satisfactory efficiency of 20.26 % can be achieved through delicate control of the entire device fabrication procedure. The optimal device, with an area of 1 cm 2 , achieves an efficiency of 17.07 %. In comparison to the common TiO 2 ETLs, those composed of TiO 2 mesocrystals show the enhanced electron extraction and suppression of charge accumulation at the perovskite/ETL interface, resulting in improved photovoltaic performance and reduced hysteresis.