| Volume
2, Article 6 |
March,
2003
|
Wide Bandgap Semiconductor Research Dr. John Crofton, Associate Professor of Physics and Engineering, has been working on electrical contacts to wide bandgap semiconductors for most of his professional life. While completing his Ph.D. at Auburn, a consortium of researchers at NASA, Westinghouse Electric, and Auburn began a collaborative project on silicon carbide (SiC) for the purpose of developing high power high temperature electronics suitable for space and other harsh environment applications. Crofton worked on the electrical contacts which were crucial for getting power into and out of the semiconductor device. Later while at Westinghouse Electric, Crofton worked on the contacts in the transistors used in the first commercial transmission of a high definition television signal. The applications of this material (SiC) include both commercial and military as well as space and terrestrial applications. Crofton is currently working on several collaborative projects including a project with Dr. David Canning in the Biology Department to selectively grow neurons on a Si chip. The Si has channels or trenches etched in the surface using a photolithographic and reactive ion etch process. |
The neurons
are then injected into the trenches and grow, hopefully synapsing, thereby
making electrical connections. "This work is very interdisciplinary
and unique. We are not sure where it is headed, but it is exciting to see
the two fields come together this way" Crofton said. In addition, Dr.
Crofton recently co-authored a $1.7 million grant that was funded by the
Air Force Office of Scientific Research to develop high temperature contacts
to SiC. This project is developing the technology that will be used in the
control electronics for an all electric aircraft and other smart technology
that will be used by military and commercial vendors. Dr. Crofton also just
completed a one semester sabbatical where he worked on ohmic contacts to
gallium nitride (GaN) with researchers at Sandia National Laboratories.
Sandia is trying to develop solid state biologic agent detectors using GaN
ultraviolet emitters. The UV emitters will be fabricated out of GaN, and
similar to the issues with SiC, low resistance contacts are required to
get sufficient electrical power into the GaN device in order to get enough
UV light from the device to detect Anthrax or other biologic agents. When Crofton is not working at MSU, he enjoys spending time with his 7 year old son Max and his wife Judy. Crofton also enjoys flying, coaching soccer, volunteering at Murray Elementary School, and getting involved in local politics and charitable organizations. |
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