DiaPRO- CVD Diamond films with improved PROperties
Abstract
The optical and thermal properties of diamond make it the ultimate material for demanding applications. However, the small area and high price of available single crystalline substrates prevent their generalized use. Large-area (several inch) polycrystalline diamond substrates can be fabricated by chemical vapor deposition (CVD), however their optical and thermal properties are hampered by the presence of non sp3carbon bonds at the grain boundaries. This project aims at fabricating diamond films with improved thermo-optical properties by means of combined CVD-laser annealing cycles. During the first CVD step, thin diamond films will be deposited on silicon substrates. The films will then be annealed with UV radiation, which will promote the conversion of the non-sp3bonds at the grain boundaries to sp3bonds. Thicker diamond films will then be obtained after a second CVD cycle. The structural and thermal properties of the films will be thoroughly characterized before and after the laser annealing step, allowing the quantification of the improvement of the thermo-optical properties.The combined CVD-laser annealing cycles will allow the fabrication of large-area polycrystalline diamond plates with decreased non-sp3content and correspondingly increased properties.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 22, 2024
- Source ID
- FA86552317245
Entities
People
- Joana Catarina Mendes
Organizations
- Air Force Office of Scientific Research
- United States Air Force