Fabrication of a Highly Functional TiO2/AZO Bilayer Electron Transport Layer for Planar Perovskite Solar Cells Fabrication of a Highly Functional TiO2/AZO Bilayer Electron Transport Layer for Planar Perovskite Solar Cells AITranslate

Basic Information:

DOI：https://doi.org/10.1021/acsaelm.2c01552

Chinese Library Classification Number:

Citation Information:

A highly functional electron transport layer (ETL) is essential for fabricating stable and efficient perovskite solar cells (PvSCs). Among the various n-type materials, mesoporous titanium dioxide (m-TiO2) is the most widely used ETL in combination with a compact layer. Despite contributing to good efficiency devices, low electron mobility, and a high annealing temperature (>450 °C) to form a crystalline film in the anatase phase, the use of m-TiO2 is a bottleneck for perovskite technology. Aluminum-doped zinc oxide (AZO) is a potential replacement for m-TiO2 as an ETL due to its relatively high electron mobility, high transparency, and low-temperature processing. Here, we demonstrate a low-temperature solution-processed TiO2/AZO bilayer thin film as ETL in a planar PvSCs configuration, which exhibits a power conversion efficiency of 13.94% with a JSC of 19.49 mA/cm2, a VOC of 1.05V, and a FF of 68% with a pixel area of 0.25 cm2. The unencapsulated TiO2/AZO-ETL-based PvSCs retained 70% of their initial efficiency after 1000 h in an ambient atmosphere. Our studies demonstrated that the solution-processed TiO2/AZO bilayer ETLs provide a promising approach for developing low-temperature, high-performance, and stable planar PvSCs.