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Title: Nanocrystalline Si/SiO{sub 2} core-shell network with intense white light emission fabricated by hot-wire chemical vapor deposition

We report the fabrication of a stable Si/SiO{sub 2} core-shell network using hot-wire chemical vapor deposition on a silicon substrate at a relatively low substrate temperature of 200 °C. Structural investigations using transmission electron microscopy and X-ray diffraction confirm the presence of nanocrystalline silicon and silicon dioxide quantum dots in the form of a core-shell network embedded in the amorphous SiO{sub x} matrix, while selected area electron diffraction confirms the formation of a core-shell structure. The core-shell structure exhibits a bright white emission that can be seen with the unaided eye at room temperature without any post-annealing treatments, and the observed photoemission does not alter in color or intensity after prolonged laser exposure. Additional measurements are performed while varying the laser power and optical gain is found in the as-deposited material. Intense stable white luminescence is observed and shows the prospective for various optical and biological applications in the future.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. SEES, Electrical Engineering Department, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Cinvestav-IPN, Mexico, D.F. 07360 (Mexico)
  2. Institute of Material Research, Universidad Nacional Autónoma de México, Coyoacán 04510 (Mexico)
  3. Department of Physics, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Cinvestav-IPN, Mexico, D.F. 07360 (Mexico)
  4. Departament of Electronics, Instituto Nacional de Astrofísica Óptica y Electrónica, Tonantzintla, Puebla 72000 (Mexico)
Publication Date:
OSTI Identifier:
22398960
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; CHEMICAL VAPOR DEPOSITION; CRYSTALS; ELECTRON DIFFRACTION; GAIN; LUMINESCENCE; PHOTOEMISSION; QUANTUM DOTS; SILICON; SILICON OXIDES; SUBSTRATES; TEMPERATURE RANGE 0273-0400 K; TRANSMISSION ELECTRON MICROSCOPY; VISIBLE RADIATION; X-RAY DIFFRACTION