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- 1. Phys. Rev. B 75, 085416 (2007) , “Ab initio theoretical study of hydrogen and its interaction with boron acceptors and nitrogen donors in single-wall silicon carbide nanotubes”, A. GaliSilicon carbide nanotubes have a great potential for biological applications. It is of interest to explore the electronic properties of these nanotubes, and how those are modified in the presence of impurities. Hydrogen is a common impurity that can appear during the growth of silicon carbide... (Read more)
- 2. Phys. Rev. B 74, 245212 (2006) , “Deactivation of nitrogen donors in silicon carbide”, F. Schmid, S. A. Reshanov, H. B. Weber, G. Pensl, M. Bockstedte, A. Mattausch, O. Pankratov, T. Ohshima, and H. ItohHexagonal SiC is either co-implanted with silicon (Si+), carbon (C+), or neon (Ne+) ions along with nitrogen (N+) ions or irradiated with electrons (e−) of 200 keV energy. During the subsequent annealing step at temperatures above 1450 ... (Read more)
- 3. Phys. Rev. B 74, 245201 (2006) , “Electrical resistivity and metal-nonmetal transition in n-type doped 4H-SiC”, Antonio Ferreira da Silva, Julien Pernot, Sylvie Contreras, Bo E. Sernelius, Clas Persson, and Jean CamasselThe electrical resistivity of 4H-SiC doped with nitrogen is analyzed in the temperature range 10–700 K for nitrogen concentrations between 3.5×1015 and 5×1019 cm−3. For the highest doped samples, a good agreement is found between the... (Read more)
- 4. Phys. Rev. B 74, 235434 (2006) , “Transport properties of n-type ultrananocrystalline diamond films”, I. S. Beloborodov, P. Zapol, D. M. Gruen, and L. A. CurtissWe investigate transport properties of ultrananocrystalline diamond films for a broad range of temperatures. Addition of nitrogen during plasma-assisted growth increases the conductivity of ultrananocrystalline diamond films by several orders of magnitude. We show that films produced at low... (Read more)
- 5. Phys. Rev. B 70, 193207 (2004) , “Hyperfine interaction of the nitrogen donor in 4H-SiC”, N. T. Son, E. Janzén, J. Isoya, S. YamasakiShallow N donors in n-type 4H-SiC were studied by electron paramagnetic resonance (EPR) and electron nuclear double resonance (ENDOR). For the N donor at the cubic site (Nk) in 4H-SiC, the hyperfine (hf) constants of the interaction with the nearest-neighbor... (Read more)
- 6. Phys. Rev. B 70, 085202 (2004) , “Reassignment of phosphorus-related donors in SiC”, E. Rauls, M. V. B. Pinheiro, S. Greulich-Weber, and U. GerstmannCombining efficient density-functional based tight-binding molecular dynamics with ab initio calculations, we show that despite higher formation energies the incorporation of phosphorus at the carbon sublattice is favored by kinetic effects during the annealing processes. Based on the... (Read more)
- 7. Phys. Rev. B 67, 165212 (2003) , “Optical selection rules for shallow donors in 4H-SiC and ionization energy of the nitrogen donor at the hexagonal site”, I. G. Ivanov, B. Magnusson, and E. JanzénThe selection rules for transitions between the electronic levels of shallow donors in 4H-SiC in the dipole approximation are derived. The ionization energy of the shallow nitrogen donor (at hexagonal site) is determined to be 61.4±0.5 meV by analyzing the photothermal ionization and... (Read more)
- 8. Phys. Rev. Lett. 90, 185507 (2003) , “Hydrogen Incorporation in Diamond: The Nitrogen-Vacancy-Hydrogen Complex”, C. Glover, M. E. Newton, P. Martineau, D. J. Twitchen, J. M. BakerWe report the identification of the nitrogen-vacancy-hydrogen complex in a freestanding nitrogen-doped isotopically engineered single crystal diamond synthesized by chemical vapor deposition. The hydrogen atom is located in the vacancy of a nearest-neighbor nitrogen-vacancy defect and appears to be... (Read more)
- 9. Physica B 340-342, 903-907 (2003) , “Pulsed EPR studies of shallow donor impurities in SiC”, J. Isoya, T. Ohshima, N. Morishita, T. Kamiya, H. Itoh, S. YamasakiSpin-lattice relaxation time (T1) and phase memory time (TM) of shallow donors in 3C-, 4H- and 6H-SiC have been measured in time domain by using pulsed EPR technique. The temperature dependence of T1 suggests that the Orbach process should be frozen at relatively high temperatures. Shallow donors in SiC are promising in attaining a sufficiently long phase memory time at temperatures much higher than Si:P. (Read more)
- 10. Physica B 340-342, 15-24 (2003) , “Defects in SiC”, E. Janzén, I. G. Ivanov, N. T. Son, B. Magnusson, Z. Zolnai, A. Henry, J. P. Bergman, L. Storasta, F. CarlssonRecent results from studies of shallow donors, pseudodonors, and deep level defects in SiC are presented. The selection rules for transitions between the electronic levels of shallow donors in 4H–SiC in the dipole approximation are derived and the ionization energy for the N donor at... (Read more)
- 11. Appl. Phys. Lett. 80, 1334 (2002) , “Production of nitrogen acceptors in ZnO by thermal annealing”, N. Y. Garces, N. C. Giles, L. E. Halliburton, G. Cantwell, D. B. Eason, D. C. Reynolds, D. C. LookNitrogen acceptors are formed when undoped single crystals of zinc oxide (ZnO) grown by the chemical-vapor transport method are annealed in air or nitrogen atmosphere at temperatures between 600 and 900 °C. After an anneal, an induced near-edge absorption band causes the crystals to appear... (Read more)
- 12. Phys. Rev. B 64, 235202 (2001) , “Photosensitive electron paramagnetic resonance spectra in semi-insulating 4H SiC crystals”, E. N. Kalabukhova, S. N. Lukin, A. Saxler, W. C. Mitchel, S. R. Smith, J. S. Solomon, A. O. EvwarayePhotosensitive electron paramagnetic resonance (EPR) investigations of unintentionally doped, semi-insulating (s.i.) 4H–SiC have been made at 37 GHz and 77 K including photoexcitation and photoquenching experiments. In the dark the EPR spectrum consists of a low intensity line due to boron on the... (Read more)
- 13. Phys. Rev. B 64, 085206 (2001) , “Electronic structure of the N donor center in 4H-SiC and 6H-SiC”, A. v. Duijn-Arnold, R. Zondervan, J. Schmidt, P. G. Baranov, E. N. MokhovIn this paper, we present high-frequency (95 GHz) pulsed electron paramagnetic resonance (EPR) and electron nuclear double resonance (ENDOR) measurements on the nitrogen (N) donor in 4H-SiC (k site) and 6H-SiC (h, k1, and k2 sites according to the accepted classification). From... (Read more)
- 14. Physica B 308-310, 976-979 (2001) , “Magnetic resonance studies of ZnO”, W. E. Carlos, E. R. Glaser and D. C. LookWe have used EPR and ODMR to study state-of-the-art bulk ZnO single crystals. Most of the samples are n-type; however, under certain conditions (e-irradiated or annealed), we observe a center due to residual nitrogen (g||=1.9953, g=1.9633 and Aiso=1.225 mT, Aaniso=0.864 mT). The N center is a... (Read more)
- 15. J. Appl. Phys. 87, 8773 (2000) , “Ionization energies and electron mobilities in phosphorus- and nitrogen- implanted 4H-silicon carbide”, M. A. Capano, J. A. Cooper, Jr., M. R. Melloch, A. Saxler, W. C. MitchelComparisons are made between the carrier concentrations, ionization energies, and electron mobilities in 4HSiC samples implanted with similar doses of nitrogen or phosphorus and annealed at 1300 or 1700 °C for 10 min in argon. The objective of the research is to determine which element may... (Read more)
- 16. J. Appl. Phys. 87, 3800 (2000) , “Photothermal ionization spectroscopy of shallow nitrogen donor states in 4H–SiC”, C. Q. Chen, J. Zeman, F. Engelbrecht, C. Peppermüller, R. Helbig, Z. H. Chen, G. MartinezPhotothermal ionization spectroscopy (PTIS) measurements were carried out on a free-standing, high purity and high quality 4HSiC epitaxial layer at various temperatures. The two step photothermal ionization process is clearly reflected in the temperature dependence of the photoconductivity.... (Read more)
- 17. phys. stat. sol. (b) 210, 415-427 (1998) , “The Microscopic and Electronic Structure of Shallow Donors in SiC”, S. Greulich-WeberNitrogen donors in 6H-, 4H- and 3C-SiC were investigated using conventional electron paramagnetic resonance (EPR) and electron nuclear double resonance (ENDOR) and the experimental results are discussed. An attempt is presented to interpret the experimentally found large differences in hyperfine... (Read more)
- 18. phys. stat. sol. (a) 162, 95-151 (1997) , “EPR and ENDOR Investigations of Shallow Impurities in SiC Polytypes”, S. Greulich-WeberInvestigations of nitrogen donors in 6H-, 4H- and 3C-SiC using conventional electron paramagnetic resonance (EPR), electron nuclear double resonance (ENDOR) and optical detection of EPR and ENDOR as well as optical absorption and emission spectroscopy are reviewed and critically discussed. An... (Read more)
- 19. Phys. Rev. 98, 915 (1955) , “Theory of Donor States in Silicon”, W. Kohn, J. M. Luttinger.By using the recently measured effective masses for n-type Si, m1=0.98 m and m2=0.19 m, approximate solutions of the resulting effective mass Schroedinger equation are obtained. The accuracy of the solutions was tested in the limiting cases where... (Read more)
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