Self‐Assembly Atomic Stacking Transport Layer of 2D Layered Titania for Perovskite Solar Cells with Extended UV Stability |
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| Authors: | Tzu‐Pei Chen Chung‐Wei Lin Shao‐Sian Li Yung‐Han Tsai Cheng‐Yen Wen Wendy Jessica Lin Fei‐Man Hsiao Ya‐Ping Chiu Kazuhito Tsukagoshi Minoru Osada Takayoshi Sasaki Chun‐Wei Chen |
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| Institution: | 1. Department of Materials Science and Engineering, National Taiwan University, Taipei, Taiwan;2. Department of Physics, National Taiwan University, Taipei, Taiwan;3. Nano Science and Technology Program, Taiwan International Graduate Program, Academia Sinica and National Taiwan University, Taipei, Taiwan;4. Department of Physics, National Sun Yat‐sen University, Kaohsiung, Taiwan;5. The International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, Tsukuba, Ibaraki, Japan;6. Taiwan Consortium of Emergent Crystalline Materials (TCECM), Ministry of Science and Technology, Taipei, Taiwan |
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| Abstract: | A novel atomic stacking transporting layer (ASTL) based on 2D atomic sheets of titania (Ti1?δO2) is demonstrated in organic–inorganic lead halide perovskite solar cells. The atomically thin ASTL of 2D titania, which is fabricated using a solution‐processed self‐assembly atomic layer‐by‐layer deposition technique, exhibits the unique features of high UV transparency and negligible (or very low) oxygen vacancies, making it a promising electron transporting material in the development of stable and high‐performance perovskite solar cells. In particular, the solution‐processable atomically thin ASTL of 2D titania atomic sheets shows superior inhibition of UV degradation of perovskite solar cell devices, compared to the conventional high‐temperature sintered TiO2 counterpart, which usually causes the notorious instability of devices under UV irradiation. The discovery opens up a new dimension to utilize the 2D layered materials with a great variety of homostructrual or heterostructural atomic stacking architectures to be integrated with the fabrication of large‐area photovoltaic or optoelectronic devices based on the solution processes. |
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| Keywords: | 2D materials low‐temperature processes perovskite solar cells stability |
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