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Broadband Photoresponse Based on A Synergetic Effect of Surface Ions and Plasmon Polaritons


New RbAg4I5-on-Au ionic-electronic conductors with a composite nanostructure were fabricated by coating superionic conductor RbAg4I5 film on an electronic conductor Au thin film by thermal evaporation. Through a synergetic effect of surface ions and plasmon polaritons, this composite nanostructure displays a broadband photoresponse from ultraviolet (375 nm) to near-infrared (1064 nm). Our experimental results indicate that a photocatalytic solid-state electrochemical reaction occurred at the interface of the composite nanostructure. Under ultraviolet or visible light illumination, Au atoms at the interface can be rapidly ionized into electrons and Au+ ions, which two components will recombine spontaneously under dark conditions. The formation of Au+ ions has a significant influence on the transportation channel of electrons in the Au thin film. The ionization and recombination of electrons and Au+ ions is responsible for the dynamic process of negative photoconductivity. In addition, we observed significant negative photoconductivity induced by the excited surface plasmon polaritons in the broadband spectral region from ultraviolet to near-infrared. These results pave the way for exploiting high-performance photodetectors based on ionic-electronic conductors with composite nanostructures. Moreover, the photocatalytic solid-state electrochemical reaction provides a better understanding about the interaction between metals and superionic conductors.

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Publication details

The article was received on 29 Oct 2017, accepted on 06 Jan 2018 and first published on 08 Jan 2018

Article type: Paper
DOI: 10.1039/C7TC04923D
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Broadband Photoresponse Based on A Synergetic Effect of Surface Ions and Plasmon Polaritons

    Y. Liu, J. Yin, P. Wang, J. Zhu, M. Wanyun, Z. Dong and J. Sun, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C7TC04923D

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