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Photoinduced Electron Transfer in Dye‐Sensitized SnO 2 Nanowire Field‐Effect Transistors
Author(s) -
Wu HsingChen,
Huang YuanChang,
Ding IKang,
Chen ChunCing,
Yang YiHan,
Tsai ChiaChang,
Chen ChiiDong,
Chen YitTsong
Publication year - 2011
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201001521
Subject(s) - materials science , nanowire , photoluminescence , electron transfer , excited state , optoelectronics , semiconductor , absorption spectroscopy , dye sensitized solar cell , photochemistry , electrode , optics , electrolyte , atomic physics , chemistry , physics
Electron transfer from excited dye molecules (chlorophyll or fluorescein) to a semiconductor is demonstrated by photoaction and photoluminescence spectra on field‐effect transistors consisting of dye‐sensitized individual SnO 2 nanowires. The photoaction spectrum shows a much better resolution for nanowires non‐covalently functionalized with dye molecules than for dyes deposited on SnO 2 nanoparticle‐films. Possible reasons for the deviation between the photoaction spectra and ordinary optical absorption spectra as well as for the current‐tail appearing along the falling edge are addressed. In dye‐sensitized nanowires, electron transfer from photo‐excited dyes to nanowires is analyzed by comparing gate‐voltage dependences in photoaction and photoluminescence spectra. The importance of this study is in the understanding of electron injection and recombination provided, as well as the performance optimization of nanowire‐based dye‐sensitized solar cells.