Journal
NANOPHOTONICS
Volume 8, Issue 7, Pages 1247-1254Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2019-0094
Keywords
photodetector; plasmonic hot-electron; porous Ag/TiO2; Schottky junction
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Funding
- National Natural Science Foundation of China [51701207, 51471162, 51502294, 51671183]
- CAS/SAFEA International Partnership Program for Creative Research Teams
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Due to the advantages of narrow energy distribution of plasmonic hot-electrons in Ag and the high density of states in the TiO2 conduction band, an Ag/TiO2 composite is considered to be an ideal combination to construct a plasmonic hot-electron photodetector with high detectivity and a high response speed. In this work, we fabricate a porous Ag/TiO2-Schottky-diode based plasmonic hot-electron photodetector. This detector shows a high detectivity of 9.8 x 10(10) cmHz(1/2)/W and a fast response speed, with a rise and fall time of 112 mu s and 24 mu s, respectively, under 450 nm light illumination at zero bias voltage. In addition, the height of the Ag/TiO2 Schottky barrier can be decreased by removing the chemisorbed oxygen from the surface of TiO2 with ultraviolet light illumination, and as a result, the responsivity of the Ag/TiO2 plasmonic hot-electron photodetector at 450 nm can increase from 3.4 mA/W to 7.4 mA/W.
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