DOE OSTI · 3009797
Enhanced boron doping for diamond growth in cylindrical CVD reactors using a Faraday cage
Abstract
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.
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Jiang, Y. [Univ. of Melbourne, Parkville, VIC (Australia)] (ORCID:0000000232472227), Bose, M. [Univ. of Melbourne, Parkville, VIC (Australia)] (ORCID:0000000194489318), Cuenca, J. A. [Cardiff Univ., Wales (United Kingdom)] (ORCID:0000000313701167), Creedon, D. L. [Univ. of Melbourne, Parkville, VIC (Australia); Commonwealth Scientific and Industrial Research Organisation (CSIRO), Clayton, VIC (Australia)] (ORCID:0000000329123381), Belcourt, J. [Royal Melbourne Institute of Technology (RMIT) Univ., Melbourne, VIC (Australia)] (ORCID:0009000390374427), van Engers, C. D. [Royal Melbourne Institute of Technology (RMIT) Univ., Melbourne, VIC (Australia); Quantum Brilliance Pty Ltd., Acton, ACT (Australia)] (ORCID:0000000294375801), Nadarajah, A. [Univ. of Melbourne, Parkville, VIC (Australia)], Ganesan, K. [Univ. of Melbourne, Parkville, VIC (Australia)] (ORCID:0000000189765218), McCallum, J. C. [Univ. of Melbourne, Parkville, VIC (Australia)] (ORCID:0000000266927728), Fox, K. [Royal Melbourne Institute of Technology (RMIT) Univ., Melbourne, VIC (Australia)] (ORCID:0000000180903215), Prawer, S. [Univ. of Melbourne, Parkville, VIC (Australia)] (ORCID:0000000249590828), Jamieson, D. N. [Univ. of Melbourne, Parkville, VIC (Australia)] (ORCID:0000000177336715), Stacey, A. [Royal Melbourne Institute of Technology (RMIT) Univ., Melbourne, VIC (Australia); Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); Princeton Univ., NJ (United States)] (ORCID:0000000237940317). 2025-11-03. Enhanced boron doping for diamond growth in cylindrical CVD reactors using a Faraday cage. https://doi.org/10.1016/j.diamond.2025.113009
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