Abstract
Boron-doped polycrystalline diamond thick film was prepared by a hot filament chemical vapor deposition (HFCVD) method. The morphology and structure of the diamond were evaluated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and micro-Raman spectroscopy. The carrier concentration of the boron-doped diamond was 7.3 × 1020 cm-3, determined by a Hall measurement system. The transport measurements show that the boron-doped diamond thick film is superconductive and the superconducting transition temperatures are 10 K for Tc onset and 8.3 K for zero resistance, and there is a strong diamagnetic response in the alternating current (AC) magnetic susceptibility of the boron-doped diamond sample below 8.9 K. Such a high Tc value can be attributed to the higher efficiency of doping, contraction of the reconstructed bonds and two-dimensional nature of the surface states for diamond thick films, all together inducing a stronger electron-phonon coupling.
Original language | English |
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Pages (from-to) | 659-663 |
Number of pages | 5 |
Journal | Diamond and Related Materials |
Volume | 15 |
Issue number | 4-8 |
DOIs | |
Publication status | Published - Apr 2006 |
Externally published | Yes |
Keywords
- Chemical vapor deposition
- Diamond film
- Superconductivity
- p-type doping