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Inaugural Grown Diamond Roundtable Conference “The Future of Grown Diamonds”

Meeting: Inaugural Grown Diamond Roundtable Conference “The Future of Grown Diamonds”
Agenda: Discussion on Grown Diamonds and CVD Technologies
Date: December 2, 2014
Location: Boston, MA (2014 Materials Research Society’s (MRS) Fall Meeting and Exhibit)
Host/Coordinator: Dr Devi Shanker Misra, Chief Technology Officer, IIa Technologies and Mr Richard Garard of Microwave Enterprises
In attendance:
Arizona State University
Bob Nemanich
Bristol University
Paul May
Case Western University
John Angus
Duke University
Jeff Glass
Hasselt University
Ken Haenen
IIa Technologies
DS Misra
Institute of Applied Physics
Anatoly Vikharev
Michigan State University
Jes Asmussen
Michigan State University
Tim Grotjohn
Microwave Enterprises
Dick Garard
Microwave Enterprises
Joe Wander
Microwave Enterprises
Keith Harris
Microwave Enterprises
Nan Parker
MIT, Lincoln Lab
Mark Hollis
MIT, Lincoln Lab
Michael Geis
National Dong Hwa University
Chia-Liang Cheng
University of Alabama
Sam Moore
Topics Discussed:
#1: Diamond Applications
Discussion began with listing out of applications of diamond-based devices including diamond radiation detectors as current targets for Grown Diamonds. The general difference between electronic grade and optical grade CVD diamond material was considered. Optical grade diamonds may be adequate for fundamental research and process optimization, but current electronic grade has room for improvement.
#2. Emphasis was laid on coming up with a “standard” orientation of CVD diamond plates
For electronic applications, plate orientation – consistency, direction and tilt are key parameters. “Off angle” for P-doping is required and may help lower costs.
#3: The need for a reliable and consistent supply of boron doped CVD material
IIa Technologies confirmed that it would come out with some information regarding the same.
#4: Tradeoffs for single crystal and polycrystalline needs in boron doping
Different growth patterns with a “top layer of boron” could potentially be explored, as only the top layer is key for applications, and could in turn lead to a more competitive pricing.
For electronics applications, a thin “veneer” of one or two microns of boron-doped diamond may be sufficient.
Better polishing over larger areas, specifically damage artifacts, is required for IIa Technologies’ material. IIa Technologies will strive towards achieving higher polishing levels.
#5: Providing a quality and reliable source
With the scarcity of high quality electronic grade diamond plates, it was appreciated by the group that IIa Technologies has appeared on the scene as a reliable supplier of high quality diamond plates. The need was long felt and there was appreciation all round for the quality and consistency of the IIa products.
For ultimate success in most electronic application areas, lower dislocation density is required. All CVD diamonds currently need to be further improved and have to be more consistent. Reports on IIa’s E-grade material are very positive, with improvements as a major goal of current development.
#6: Dislocation Density
For CVD diamonds to ultimately be successful for electronic applications, it must be competitive with GaN or SiC. Diamond is “better” than GaN and SiC from a material properties standpoint, but challenges remain regarding defects per area, available size, and regular orientation. Comments and feedback regarding “diamond solutions” were requested from the group.
#7: Large single crystal diamond plates
Larger single crystal diamond plates, as opposed to one or two inch diameter plates, are preferred, due to its cost effectiveness. IIa Technologies aims to develop larger plates in near future.
#8: Terminology: “Synthetic” vs. “Lab Grown”
The group also deliberated upon market terminology applied to CVD diamonds. The term ‘synthetic’ to describe lab grown diamond is not technically correct.. This was expressed as a factor in growth of the gem market which has a direct effect on funding and development for scientific CVD material. The group uses “Chemical Vapour Deposition (CVD) or High Pressure High Temperature (HPHT)” when doing citation in papers. Terms such as “Grown Diamonds” were cited as alternative. Dr D S Misra suggested to resolve in the meeting that ‘Synthetic’ should not be used as term to describe CVD diamond in research publications. .
#9: Growth Techniques
The scientific community will be revisiting growth techniques to improve the quality and advance CVD diamond performance. The potential of nano-diamond applications was explored, but nano-growth techniques will need to be improved.
#10: Tertiary Partnerships and Support
IIa has current partnerships with universities and institutions in Singapore and the US, where mutual interest exists.
#11: Future roundtable events
Following the success of the first CVD Diamond Round Table, hosted by IIa Technologies, these roundtable events will be a regular affair for the grown diamond community. Similar to the current format, for ease of logistics and availability, future meetings can be done on an annual basis on the sidelines of industry events. These meetings will enable the industry to move forward.
Overall Event Summary:
IIa Technologies’ goal for the market is to manufacture and deliver high quality grown diamonds with the fewest possible defects and is deeply committed to pursue that objective through a strong R&D focus and cutting-edge technology.