期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 6, 期 5, 页码 1199-1205出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc04923d
关键词
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资金
- National Natural Science Foundation of China [11374172, 11174172, 11374039]
- Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics [ZZ 201703]
New RbAg4I5-on-Au ionic-electronic conductors with a composite nanostructure were fabricated by coating a superionic conductor RbAg4I5 film on an electronic conductor Au thin film by thermal evaporation. Through a synergistic 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, in which the 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 are responsible for the dynamic process of negative photoconductivity. In addition, we observed a 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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