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Boosted UV Sensitivity of Er-Doped In2O3 Thin Films Using Plasmonic Ag Nanoparticle-Based Surface Texturing

Ag nanoparticles (NPs) were deposited on the sol-gel-processed Erbium-doped Indium Oxide (In 2 O 3 :Er) thin films (TFs) using thermal evaporation cum glancing angle deposition technique for the first time. The grazing incidence X-ray diffraction analysis confirms the presence of a face-centered cub...

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Bibliographic Details
Published in:Plasmonics (Norwell, Mass.) Mass.), 2018-06, Vol.13 (3), p.1105-1113
Main Authors: Ghosh, Anupam, Dhar Dwivedi, Shyam Murli Manohar, Ghadi, Hemant, Chinnamuthu, Paulsamy, Chakrabarti, Subhananda, Mondal, Aniruddha
Format: Article
Language:English
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Summary:Ag nanoparticles (NPs) were deposited on the sol-gel-processed Erbium-doped Indium Oxide (In 2 O 3 :Er) thin films (TFs) using thermal evaporation cum glancing angle deposition technique for the first time. The grazing incidence X-ray diffraction analysis confirms the presence of a face-centered cubic structure of Ag NPs and monoclinic crystal structure of Ag 3 O 4 . The presence of Ag NPs on In 2 O 3 :Er TFs reduced the photoluminescence emission intensity. Au/In 2 O 3 :Er/Si and Au/In 2 O 3 :Er/Ag NPs/In 2 O 3 :Er/Si (plasmonic) Schottky contact-based detectors were fabricated. Presence of Ag NPs on the In 2 O 3 :Er TFs enhanced the photoconduction for the plasmonic detector. The photoresponsivity of the plasmonic device was ∼ 8.7 times greater than In 2 O 3 :Er TF-based device for 380 nm wavelength at an applied bias of − 6.6 V. The plasmonic device showed a maximum internal gain of ~ 3181 at 380 nm wavelength. The plasmonic device possessed higher detectivity and lower noise equivalent power as compared to In 2 O 3 :Er TF in the ultraviolet (UV) region. The plasmonic device exhibited excellent temporal response with rise and fall time of ~ 0.25 and ~ 0.12 s, respectively. The admirable characteristics of the simple plasmonic device structure can commercially emerge out as UV detector.
ISSN:1557-1955
1557-1963
DOI:10.1007/s11468-017-0679-x