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Saeid Ghamaty, Ph.D.
Test and Materials Physicist
Professional Speciality:
Solid State Physics of semiconductor, superconductor and high temperature materials in bulk or multilayer films.Education:
B.S. Physics & Applied Physics, California Institute of TechnologyM.S. Physics, University of California, San Diego
Ph.D. Experimental Physics, University of California, San Diego, 1990
Dr. Saeid Ghamaty, heads up the QW development at Hi-Z and will be responsible for the fabrication and evaluation of the films and technical coordination. Dr. Ghamaty has been involved with QW thermoelectrics since their inception on a DOE funded SBIR in 1994 and presented the first thermoelectric experimental data demonstrating that multiple layers of Si/SiGe QWs yield large gains in the power factor (Seebeck coefficient2/electrical resistivity) and the resultant high figures of merit (Z) which are very favorable for power and cooling applications. Since these initial studies, he has been developing the B4C/B9C QW materials for power applications which are exhibiting ZTs that are 3 to 4 times better than the present bulk Bi2Te3 based alloys.. He has recently measured an efficiency of 14% on a Si/SiGe-B4C/B9C couple which is the higher experimentally measured efficiency reported to date.
Dr. Ghamaty has developed techniques for metallizing the ends of the 100 Å thick quantum well layers so low contact resistances are obtained and optimum thermoelectric performance is realized. In addition, he has constructed a 3-omega thermal conductivity for measuring thermal conductivity.
Dr. Ghamaty is the prime author/co-author of several QW patents including Si/SiGe, B4C/B9C and Si/SiC materials. He is also involved with modeling semiconductor and high temperature materials. He was a postdoctoral research physicist for the Dept. of Physics, UCSD, from 1990 to June 1991; a research assistant in the same department from 1983 to 1990; and a teaching assistant from 1981 to 1983. Dr. Ghamaty has worked with experimental techniques in cryogenics, high-vacuum condensed matter, and superconductivity (classical and high-temperature superconductors), including the design and construction of a system for measuring thermal conductivity and resistivity for samples as small as 10 T diameter fibers to as large as 1 in. x 1 in. blocks in high-vacuum and computer-controlled. He also designed and built a system for measuring eddy currents in metals using SQUIDS. Dr. Ghamaty has published numerous papers on solid state phenomena and has been awarded/co-awarded six patents.