Properties of Plasmon-Induced Photoelectric Conversion on a TiO2/NiO p–n Junction with Au Nanoparticles

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• 作者：Keisuke Nakamura ; Tomoya Oshikiri ; Kosei Ueno ; Yongming Wang ; Yoshiomi Kamata ; Yuki Kotake ; Hiroaki Misawa
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2016
• 出版时间：March 17, 2016
• 年：2016
• 卷：7
• 期：6
• 页码：1004-1009
• 全文大小：435K
• ISSN：1948-7185

文摘

We have successfully fabricated all-solid-state plasmonic photoelectric conversion devices composed of titanium dioxide (TiO₂)/nickel oxide (NiO) p–n junctions with gold nanoparticles (Au-NPs) as prototype devices for a plasmonic solar cell. The characteristics of the crystal structures and the photoelectric properties of the all-solid-state devices were demonstrated. We observed that the crystalline structure of the NiO thin film and the interfacial structure of TiO₂/Au-NPs/NiO changed significantly during an annealing treatment. Furthermore, the photoelectric conversion devices exhibited plasmon-induced photocurrent generation in the visible-wavelength region. The photocurrent may result from plasmon-induced charge separation. The photoelectric conversion properties via plasmon-induced charge separation were strongly correlated with the morphology of the TiO₂/Au-NPs/NiO interface. The long-term stability of the plasmonic photoelectric conversion device was found to be very high because a stable photocurrent was observed even after irradiation for 3 days.