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Unconventional Route to Oxygen-Vacancy-Enabled Highly Efficient Electron Extraction and Transport in Perovskite Solar Cells |
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| Authors: | Dr. Bing Wang Dr. Meng Zhang Dr. Xun Cui Zewei Wang Matthew Rager Prof. Yingkui Yang Prof. Zhigang Zou Prof. Zhong Lin Wang Prof. Zhiqun Lin |
| Affiliation: | 1. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332 USA Eco-materials and Renewable Energy Research Center, National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, 210093 P. R. China;2. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332 USA;3. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332 USA Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, 430074 China;4. Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education & Hubei Key Laboratory of Catalysis and Materials Science, South-Central University for Nationalities, Wuhan, 430074 China;5. Eco-materials and Renewable Energy Research Center, National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing, 210093 P. R. China |
| Abstract: | The ability to effectively transfer photoexcited electrons and holes is an important endeavor toward achieving high-efficiency solar energy conversion. Now, a simple yet robust acid-treatment strategy is used to judiciously create an amorphous TiO2 buffer layer intimately situated on the anatase TiO2 surface as an electron-transport layer (ETL) for efficient electron transport. The facile acid treatment is capable of weakening the bonding of zigzag octahedral chains in anatase TiO2, thereby shortening staggered octahedron chains to form an amorphous buffer layer on the anatase TiO2 surface. Such amorphous TiO2-coated ETL possesses an increased electron density owing to the presence of oxygen vacancies, leading to efficient electron transfer from perovskite to TiO2. Compared to pristine TiO2-based devices, the perovskite solar cells (PSCs) with acid-treated TiO2 ETL exhibit an enhanced short-circuit current and power conversion efficiency. |
| Keywords: | Säurebehandlung Amorphe Materialien Elektronentransportschichten Sauerstoffleerstellen Perowskit-Solarzellen |