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High-Efficiency Perovskite Solar Cells Enabled by Anatase TiO2 Nanopyramid Arrays with an Oriented Electric Field |
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| Authors: | Dr Yinhua Lv Ruihan Yuan Dr Bing Cai Behzad Bahrami Ashraful Haider Chowdhury Dr Chi Yang Dr Yihui Wu Prof Qiquan Qiao Prof Shengzhong |
| Institution: | 1. Sichuan Research Center of New Materials, Institute of Chemical Materials, China Academy of Engineering Physics, 596 Yinhe Road, Shuangliu, Chengdu, 610200 China
These authors contributed equally to this work.;2. Sichuan Research Center of New Materials, Institute of Chemical Materials, China Academy of Engineering Physics, 596 Yinhe Road, Shuangliu, Chengdu, 610200 China;3. Department of Electrical Engineering, Center for Advanced Photovoltaics, South Dakota State University, Brookings, SD, 57007 USA;4. Institute for Advanced Study, Chengdu University, 2025 Chengluo Avenue, Chengdu, 610106 China;5. School of Materials Science and Engineering, Shanxi Normal University, Xi'an, 710119 China |
| Abstract: | One-dimensional (1D) nanostructured oxides are proposed as excellent electron transport materials (ETMs) for perovskite solar cells (PSCs); however, experimental evidence is lacking. A facile hydrothermal approach was employed to grow highly oriented anatase TiO2 nanopyramid arrays and demonstrate their application in PSCs. The oriented TiO2 nanopyramid arrays afford sufficient contact area for electron extraction and increase light transmission. Moreover, the nanopyramid array/perovskite system exhibits an oriented electric field that can increase charge separation and accelerate charge transport, thereby suppressing charge recombination. The anatase TiO2 nanopyramid array-based PSCs deliver a champion power conversion efficiency of approximately 22.5 %, which is the highest power conversion efficiency reported to date for PSCs consisting of 1D ETMs. This work demonstrates that the rational design of 1D ETMs can achieve PSCs that perform as well as typical mesoscopic and planar PSCs. |
| Keywords: | 1D nanostructures anatase TiO2 electric field distribution nanopyramid arrays power conversion efficiency |