研究・研究者
研究会・セミナー
| 演 題 | 「Photo-driven Molecular Dipole Reordering in Metalorganic Halide Perovskites」 |
|---|---|
| 日 時 | 2019年04月23日(火) 15:40 |
| 講演者 | Prof. Ya-Ping Chiu（Department of Physics National Taiwan University, Taiwan） |
| 場 所 | 分子科学研究所 研究棟2階201号室 |
| 概 要 |
Organometal halide perovskites enabled an explosive improvement of the efficiency of solar cells. Theoretical calculations suggest that the orientation of the organic molecules’ dipole may affect the electronic structure. However, thus far no real space experimental mapping of the molecule orientation and potential has been reported. Here, we map simultaneously the molecule dipole orientation pattern and the electrostatic potential with atomic resolution and under laser illumination using scanning tunneling microscopy and spectroscopy. We observe a light-induced transition of the molecule orientation order creating one-dimensional potential wells, which enable electron-hole separation. We anticipate that light-induced polarization order transition could be at the origin of the extraordinary efficiencies of organometal halide perovskite-based solar cells.
[1] Hung-Chang Hsu, Bo-Chao Huang, Shu-Cheng Chin, Cheng-Rong Hsing, Duc-Long Nguyen, Michael Schnedler, Raman Sankar, Rafal E. Dunin-Borkowski, Ching-Ming Wei, Chun-Wei Chen, Philipp Ebert, and Ya-Ping Chiu, “Photo-Driven Dipole Reordering: Key to Carrier Separation in High Efficiency Halide Perovskite Solar Cells”, (ACS Nano, in publication, 2019). |
| その他 |
所内対応者：山本 浩史（協奏分子システム研究センター） |
