Improve Hole Collection by Interfacial Chemical Redox Reaction at a Mesoscopic NiO/CH3NH3PbI3 Heterojunction for Efficient Photovoltaic Cells

Ming Wei Lin, Kuo Chin Wang, Jeng Han Wang, Ming Hsien Li, Yu Ling Lai, Takuji Ohigashi, Nobuhiro Kosugi, Peter Chen, Der Hsin Wei, Tzung Fang Guo, Yao Jane Hsu

研究成果: Article同行評審

12 引文 斯高帕斯(Scopus)

摘要

Organometal-trihalide-perovskite-based solar cells have exhibited high efficiencies when incorporated into mesoscopic NiO (NiOnc) hole-transport layers. The integration of a NiOnc-perovskite heterojunction provides an inorganic alternative as a p-type contact material with efficient hole extraction for perovskite-based solar cells. Herein the origin of such highly efficient carrier transport is studied in terms of electronic, chemical and transport properties of a NiOnc-perovskite heterojunction with X-ray photoelectron spectra, ultraviolet photoelectron spectra, near-edge X-ray absorption fine structure spectra, a scanning transmission X-ray microscope, and calculations of electronic structure. A pronounced chemical redox reaction is found at an NiOnc-perovskite heterojunction such that PbI2 is oxidized to PbO with subsequent formation of hole-dopant CH3NH3PbI3–2δOδ at the heterojunction. The generation of hole-doping CH3NH3PbI3–2δOδ induced by the redox reaction at the NiOnc/perovskite heterojunction plays a significant role to facilitate the carrier transport, and thus enhances the photovoltaic efficiencies.

原文English
文章編號1600135
期刊Advanced Materials Interfaces
3
發行號17
DOIs
出版狀態Published - 2016 九月 6

All Science Journal Classification (ASJC) codes

  • 材料力學
  • 機械工業

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