Enhanced boron doping for diamond growth in cylindrical CVD reactors using a Faraday cage
We report on the use of 3D-printed titanium Faraday cages in a cylindrical resonant cavity CVD reactor for the growth of heavily boron-doped single-crystalline superconducting diamond. We show that the cage enhances boron doping uniformity and provides control of the doping efficiency and growth rate by varying the distance between the plasma and the diamond surface. Using finite element modelling, we demonstrate that the Faraday cage focuses the electric field at the top of the cage whilst also suppressing the electric field inside the cage, thereby pinning the plasma at a fixed height above the sample. This eliminates plasma “hot spots” at the edges of the sample and creates a more uniform plasma electron and hydrogen radical distribution over the sample, resulting in a more uniform boron incorporation. • Utilises 3D-printed Faraday cage for CVD heavily boron-doped diamond growth. • Controls the plasma to substrate surface distance by using the cage. • Enhanced boron doping uniformity and concentration with the cage. • Hydrogen plasma study of the CVD and cage geometry using finite element modelling.
Authors
- Alastair Stacey (ORCID: https://orcid.org/0000-0002-3794-0317)
- A. Nadarajah
- David N. Jamieson (ORCID: https://orcid.org/0000-0001-7733-6715)
- Manjith Bose (ORCID: https://orcid.org/0000-0001-9448-9318)
- Daniel L. Creedon (ORCID: https://orcid.org/0000-0003-2912-3381)
- Jiang Yi (ORCID: https://orcid.org/0000-0002-3247-2227)
- Christian D. van Engers (ORCID: https://orcid.org/0000-0002-9437-5801)
- James A. Belcourt (ORCID: https://orcid.org/0009-0003-9037-4427)
- Jeffrey C. McCallum (ORCID: https://orcid.org/0000-0002-6692-7728)
- Kate Fox (ORCID: https://orcid.org/0000-0001-8090-3215)
- Jerome A. Cuenca (ORCID: https://orcid.org/0000-0003-1370-1167)
- Steven Prawer (ORCID: https://orcid.org/0000-0002-4959-0828)
- Kumaravelu Ganesan (ORCID: https://orcid.org/0000-0002-0208-6077)
Institutions
- Commonwealth Scientific and Industrial Research Organisation (AU)
- The University of Melbourne (AU)
- Princeton Plasma Physics Laboratory (US)
- Centre for Quantum Computation and Communication Technology (AU)
- CSIRO Manufacturing (AU)
- Cardiff University (GB)
- RMIT University (AU)
Publication Details
- Journal
- Diamond and Related Materials
- Published
- 2025-11-03
- DOI
- https://doi.org/10.1016/j.diamond.2025.113009
- Primary Topic
- Diamond and Carbon-based Materials Research
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- Australian National Fabrication Facility