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Full-Text Articles in Physics
Forming B1-XCX Semiconductor Layers By Chemical Vapor Deposition, Peter A. Dowben
Forming B1-XCX Semiconductor Layers By Chemical Vapor Deposition, Peter A. Dowben
Peter Dowben Publications
Active semiconductor devices including heterojunction diodes and thin film transistors are formed by PECVD deposition of a boron carbide thin film on an N-type substrate. The boron to carbon ratio of the deposited material is controlled so that the film has a suitable band gap energy. Boron carbides such as B4.7C, B7.2C and B19C have suitable band gap energies between 0.8 and 1.7 eV. The stoichiometry of the film can be selected by varying the partial pressure of precursor gases, such as nido pentaborane and methane. The precursor gas or gases are energized. e.g., …
Nickel Doping Of Boron–Carbon Alloy Films And Corresponding Fermi Level Shifts, Seong-Don Hwang, N. Remmes, Peter A. Dowben, D.N. Mcilroy
Nickel Doping Of Boron–Carbon Alloy Films And Corresponding Fermi Level Shifts, Seong-Don Hwang, N. Remmes, Peter A. Dowben, D.N. Mcilroy
Peter Dowben Publications
We have grown nickel doped boron–carbon alloy films by the technique of plasma enhanced chemical vapor deposition. The source gas closo-1,2-dicarbadodecaborane (orthocarborane) was used to grow the boron–carbon alloy, while nickelocene [Ni)C5H5)2] was used as the dopant source for nickel. With sufficient levels of Ni doping, diodes with characteristic tunnel diode behavior can be fabricated. The doping of nickel transformed a B5C p-type material, relative to lightly doped n-type silicon, to a strongly n-type material. In order to gain insight into the shift of the Fermi level of the …
Nickel Doping Of Boron–Carbon Alloy Films And Corresponding Fermi Level Shifts, Seong-Don Hwang, N. Remmes, Peter A. Dowben, D.N. Mcilroy
Nickel Doping Of Boron–Carbon Alloy Films And Corresponding Fermi Level Shifts, Seong-Don Hwang, N. Remmes, Peter A. Dowben, D.N. Mcilroy
Peter Dowben Publications
We have grown nickel doped boron–carbon alloy films by the technique of plasma enhanced chemical vapor deposition. The source gas closo-1,2-dicarbadodecaborane (orthocarborane) was used to grow the boron–carbon alloy, while nickelocene [Ni(C5H5)2] was used as the dopant source for nickel. With sufficient levels of Ni doping, diodes with characteristic tunnel diode behavior can be fabricated. The doping of nickel transformed a B5C p-type material, relative to lightly doped n-type silicon, to a strongly n-type material. In order to gain insight into the shift of the Fermi level of the …
Fabrication Of Micron Scale Magnetic Nickel Features By Selective Area Organometallic Chemical Vapor Deposition, D. Welipitiya, C.N. Borca, Peter A. Dowben
Fabrication Of Micron Scale Magnetic Nickel Features By Selective Area Organometallic Chemical Vapor Deposition, D. Welipitiya, C.N. Borca, Peter A. Dowben
Peter Dowben Publications
We demonstrate that it is possible to deposit a wide range of magnetic features, using photo-assisted and electron radiation induced selective area organometallic chemical vapor deposition. Large arrays of identical micron to nano scale Ni features were deposited by these methods. Their magnetic properties were studied by alternating gradient force magnetometry as well as magnetic force microscopy. Our morphological and magnetic measurements show that the structures are spatially well defined, and the magnetic properties are related to the structural shapes of the features.
Preferential Bonding Orientations Of Ferrocene On Surfaces, C. Waldfried, D. Welipitiya, C. W. Hutchings, H. S. V. De Silva, Gordon A. Gallup, Peter A. Dowben, W. W. Pai, Jiandi Zhang, J. F. Wendelken, N. M. Boag
Preferential Bonding Orientations Of Ferrocene On Surfaces, C. Waldfried, D. Welipitiya, C. W. Hutchings, H. S. V. De Silva, Gordon A. Gallup, Peter A. Dowben, W. W. Pai, Jiandi Zhang, J. F. Wendelken, N. M. Boag
Peter Dowben Publications
We have measured the molecular orientation and bonding of adsorbed ferrocene on Ag(100) and Cu(100) using angle-resolved photoemission spectroscopy (ARPES). The results for molecular adsorption on Ag(100) are complemented by high-resolution electron energy loss spectroscopy (HREELS) measurments and ab initio calculations for the ferrocene vibrational modes. The measurements indicate that ferrocene adsorbs on Ag(100) with the molecular axis perpendicular to the surface. In contrast, as indicated using ARPES and scanning tunneling microscopy, ferrocene adsorbed on the Cu(100) surface is oriented with the molecular axis parallel with the surface. Model calculations allow us to assign all of the observed vibrational modes …
Inner-Shell Excitation Spectroscopy Of Closo-Carboranes, Adam P. Hitchcock, Stephen G. Urquhart, Alex T. Wen, A. L. David Kilcoyne, Tolek Tyliszczak, Eckart Rühl, Nobuhiro Kosugi, John D. Bozek, James T. Spencer, David N. Mcilroy, Peter A. Dowben
Inner-Shell Excitation Spectroscopy Of Closo-Carboranes, Adam P. Hitchcock, Stephen G. Urquhart, Alex T. Wen, A. L. David Kilcoyne, Tolek Tyliszczak, Eckart Rühl, Nobuhiro Kosugi, John D. Bozek, James T. Spencer, David N. Mcilroy, Peter A. Dowben
Peter Dowben Publications
Oscillator strength spectra in the region of B 1s and C 1s excitation of three isomeric carborane cage compounds [closo-1,2-orthocarborane, closo-1,7-metacarborane, closo-1,12-paracarborane (C2B10H12)] have been derived from inner-shell electron energy loss spectra (ISEELS) recorded under electric dipole-scattering conditions. Total ion yield spectra recorded at high resolution with synchrotron radiation are also reported. The spectral features are assigned on the basis of comparisons with spectral predictions derived from the results of ab initio and semiempirical (extended Hückel) molecular orbital calculations. The isomeric and core level variations in the discrete core excitations …