Photodriven Dipole Reordering: Key to Carrier Separation in Metalorganic Halide Perovskites

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*, Ya Ping Chiu

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

39 引文 斯高帕斯(Scopus)

摘要

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.

原文英語
頁(從 - 到)4402-4409
頁數8
期刊ACS Nano
13
發行號4
DOIs
出版狀態已發佈 - 2019 4月 23

ASJC Scopus subject areas

  • 一般材料科學
  • 一般工程
  • 一般物理與天文學

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