Broadband photoresponse based on a synergistic effect of surface ions and plasmon polaritons
| Autor: | Yu Liu, Jun Yin, Jia-Lin Sun, Wanyun Ma, Pengfei Wang, Jin-Lin Zhu, Zhanmin Dong |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Nanostructure business.industry Photoconductivity 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Surface plasmon polariton 0104 chemical sciences Ion Ionization Materials Chemistry Fast ion conductor Optoelectronics Thin film 0210 nano-technology business Plasmon |
| Zdroj: | Journal of Materials Chemistry C. 6:1199-1205 |
| ISSN: | 2050-7534 2050-7526 |
| DOI: | 10.1039/c7tc04923d |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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