Deep-ultraviolet photodetectors from epitaxially grown Ni{sub x}Mg{sub 1-x}O

Journal Article · Mon Oct 18 00:00:00 EDT 2010 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3503634· OSTI ID:21464525

Mares, J W; Boutwell, R C; Wei, M; Scheurer, A; Schoenfeld, W V ^[1]

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1. CREOL/College of Optics and Photonics, University of Central Florida, 4000 Central Florida Blvd., Orlando, Florida 32816 (United States)

Deep-ultraviolet (DUV) photodetectors were fabricated from high quality Ni{sub x}Mg{sub 1-x}O epitaxially grown by plasma-assisted molecular beam epitaxy on an approximately lattice matched MgO <100> substrate. A mid-range Ni composition (x=0.54) Ni{sub x}Mg{sub 1-x}O film was grown for DUV ({lambda}{sub peak}<300 nm) photoresponse and the film was characterized by reflected high-energy electron diffraction, Rutherford backscattering spectroscopy, x-ray diffraction, and optical transmission measurements. Photoconductive detectors were then fabricated by deposition of symmetric interdigitated contacts (10 nm Pt/150 nm Au) with contact separations of 5, 10, and 15 {mu}m. The detectors exhibited peak responsivities in the DUV ({lambda}{sub peak{approx_equal}}250 nm) as high as 12 mA/W, low dark currents (I{sub dark}<25 nA), and DUV:visible rejection ratio of approximately 800:1.

• OSTI ID: 21464525
• Journal Information: Applied Physics Letters, Vol. 97, Issue 16; Other Information: DOI: 10.1063/1.3503634; (c) 2010 American Institute of Physics; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONCENTRATION RATIO
CRYSTAL GROWTH
CRYSTAL LATTICES
DEPOSITION
ELECTRIC CURRENTS
ELECTRON DIFFRACTION
MAGNESIUM OXIDES
MOLECULAR BEAM EPITAXY
NICKEL COMPOUNDS
PHOTODETECTORS
REFLECTION
RUTHERFORD BACKSCATTERING SPECTROSCOPY
SEMICONDUCTOR MATERIALS
SUBSTRATES
THIN FILMS
ULTRAVIOLET RADIATION
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL GROWTH METHODS
CRYSTAL STRUCTURE
CURRENTS
DIFFRACTION
DIMENSIONLESS NUMBERS
ELECTROMAGNETIC RADIATION
EPITAXY
FILMS
MAGNESIUM COMPOUNDS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
SCATTERING
SPECTRA
SPECTROSCOPY
TRANSITION ELEMENT COMPOUNDS