Electronic Structures of Aluminum-Doped Diamond near the Fermi Level
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2015-03-09 |
| Journal | Journal of the Physical Society of Japan |
| Authors | M. Mori, Yosuke Saeki, Masaki Hakamata, Takuya Sato, Eiki Kabasawa |
| Institutions | University of Electro-Communications, College of Industrial Technology |
| Citations | 7 |
Abstract
Section titled āAbstractāAluminum-doped diamond samples were synthesized using the conventional microwave plasma chemical vapor deposition method. The electronic structures were measured using an electron probe microanalyzer and by X-ray photoelectron spectroscopy. The area intensity of the partial profile of Al-3p near the Fermi level increased with increasing aluminum concentration in the sample. The partial profile of Al-3p resembles that of C-2p at high aluminum concentrations, which suggests strong hybridization between Al-3p and C-2p. Additionally, the temperature dependence of the electric resistance yields an activation energy of 8.2 meV at room temperature. The present results suggest the metal-insulator transition of aluminum-doped diamond, similar to that of boron-doped diamond. However, with increasing aluminum concentration, a considerable amount of carriers is not doped to C-2p orbitals in aluminum-doped diamond. The present results indicate that superconductivity in aluminum-doped diamond with the same mechanism as that in boron-doped diamond does not occur.