Accession Number : ADA310891
Title : Growth, Characterization and Device Development in Monocrystalline Diamond Films.
Descriptive Note : Quarterly technical rept. 1 Apr-30 Jun 96,
Corporate Author : NORTH CAROLINA STATE UNIV AT RALEIGH DEPT OF MATERIALS SCIENCE AND ENGINEERING
Personal Author(s) : Davis, R. F. ; Nemanich, R. J. ; Sitar, Z. ; Bergman, L. ; Bozeman, S. P.
PDF Url : ADA310891
Report Date : JUN 1996
Pagination or Media Count : 67
Abstract : Nuclear transmutation of boron to lithium is being investigated for donor doping of diamond Homoepitaxial (10)B enriched diamond films have been grown and characterized using Hall measurements and Raman and photoluminescence spectroscopies. The films have been neutron-irradiated at a dose of 3xl0(exp 20)n/sq cm. Gamma ray spectroscopy of the samples indicates an activity of 5microns Ci of (110)Ag. The samples are now being cleaned to remove this contaminant. The field emission energy distribution was measured from a molybdenum nanoscale field emitter before and after diamond coating. After coating, the Mo needle had a lower 'turn-on' voltage that was attributed to the diamond crystals acting as micro-tips which enhanced the field. The 'turn-on' voltage further decreased after in vacuo annealing of this needle. A second peak appeared with an effective work function close to the expected value for molybdenum carbide. An attempt to hydrogen terminate the diamond coating was unsuccessful as the treatment removed the diamond coating and partially melted the needle. The increase in the 'turn on' voltage most probably reflected the increase in the radius of curvature of the emission area. Under the conditions studied no peaks were observed that could be directly related to emission from the diamond particles. An in-depth review of the optical properties of diamond films and particles is also included.
Descriptors : *FILMS, *DIAMONDS, *EPITAXIAL GROWTH, *BORON, MEASUREMENT, OPTICAL PROPERTIES, PEAK VALUES, ANNEALING, HALL EFFECT, PHOTOLUMINESCENCE, ENERGY, VOLTAGE, SINGLE CRYSTALS, CHEMICAL VAPOR DEPOSITION, MOLYBDENUM, CARBIDES, HYDROGEN, LITHIUM, COATINGS, FIELD EMISSION, PARTICLES, ELECTRON DONORS, DOPING, CRYSTAL GROWTH, RAMAN SPECTRA, LOW VOLTAGE, NEUTRON IRRADIATION, GAMMA RAY SPECTROSCOPY, NUCLEAR TRANSMUTATION.
Subject Categories : Inorganic Chemistry
Coatings, Colorants and Finishes
Electricity and Magnetism
Atomic and Molecular Physics and Spectroscopy
Distribution Statement : APPROVED FOR PUBLIC RELEASE