https://scholars.lib.ntu.edu.tw/handle/123456789/432773
Title: | Photodriven Dipole Reordering: Key to Carrier Separation in Metalorganic Halide Perovskites | Authors: | Hsu H.-C. et al. Huang B.-C. Chin S.-C. Hsing C.-R. Nguyen D.-L. Schnedler M. Sankar R. Dunin-Borkowski R.E. Wei C.-M. CHUN-WEI CHEN Ebert P. YA-PING CHIU |
Keywords: | egrees of freedom (mechanics); Electrostatics; Excitons; Molecules; Optoelectronic devices; Perovskite; Polarization; Scanning tunneling microscopy; Separation; Electrostatic potentials; Halide perovskites; Ordering transitions; photodriven dipole reordering; Scanning tunneling microscopy/spectroscopy; Transport channel; Perovskite solar cells | Issue Date: | 2019 | Publisher: | American Chemical Society | Journal Volume: | 13 | Journal Issue: | 4 | Start page/Pages: | 4402-4409 | Source: | ACS Nano | Abstract: | Photodriven dipole reordering of the intercalated organic molecules in halide perovskites has been suggested to be a critical degree of freedom, potentially affecting physical properties, device performance, and stability of hybrid perovskite-based optoelectronic devices. However, thus far a direct atomically resolved dipole mapping under device operation condition, that is, illumination, is lacking. Here, we map simultaneously the molecule dipole orientation pattern and the electrostatic potential with atomic resolution using photoexcited cross-sectional scanning tunneling microscopy and spectroscopy. Our experimental observations demonstrate that a photodriven molecule dipole reordering, initiated by a photoexcited separation of electron-hole pairs in spatially displaced orbitals, leads to a fundamental reshaping of the potential landscape in halide perovskites, creating separate one-dimensional transport channels for holes and electrons. We anticipate that analogous light-induced polarization order transitions occur in bulk and are at the origin of the extraordinary efficiencies of organometal halide perovskite-based solar cells as well as could reconcile apparently contradictory materials' properties. ? 2019 American Chemical Society. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85065346519&doi=10.1021%2facsnano.8b09645&partnerID=40&md5=2534e2f419a5391a5910f057df2b1c0d https://scholars.lib.ntu.edu.tw/handle/123456789/432773 |
ISSN: | 19360851 | DOI: | 10.1021/acsnano.8b09645 | SDG/Keyword: | Degrees of freedom (mechanics); Electrostatics; Excitons; Molecules; Optoelectronic devices; Perovskite; Polarization; Scanning tunneling microscopy; Separation; Electrostatic potentials; Halide perovskites; Ordering transitions; photodriven dipole reordering; Scanning tunneling microscopy/spectroscopy; Transport channel; Perovskite solar cells |
Appears in Collections: | 材料科學與工程學系 |
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