Progress in the optimization of n-type and p-type SiGe thermoelectric materials
- Jet Propulsion Laboratory, 4800, Oak Grove Drive, Pasadena, California 91109 (United States)
- Thermotrex Technologies Corporation, 85, First Avenue, Waltham, Massachusetts 02254-9046 (United States)
A comprehensive experimental and theoretical work has been conducted in order to optimize the thermoelectric properties of Si[sub 80]Ge[sub 20] materials and reach the goal of a combined figure of merit value of 0.85[times]10[sup [minus]3] K[sup [minus]1] averaged over 600--1000 C temperature range. Improvement for the n-type material have been obtained by determining the optimum amounts of gallium and phosphorus dopants necessary to achieve optimum carrier mobility and concentration. The emphasis is now on the good reproducibility of these results through understanding and control of the processing parameters relating microstructure and composition to the transport properties. The optimum doping level has now been firmly established for p-type materials, and work is concentrating on the reduction in thermal conductivity. BN ultra fine particles have been successfully incorporated into fully dense samples and have resulted in desired improvement of the figure of merit. Efforts are being made to reproduce these encouraging results.
- OSTI ID:
- 5532967
- Report Number(s):
- CONF-930103-; CODEN: APCPCS
- Journal Information:
- AIP Conference Proceedings (American Institute of Physics); (United States), Vol. 271:2; Conference: 10. symposium on space nuclear power and propulsion, Albuquerque, NM (United States), 10-14 Jan 1993; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Gallium composition dependence of crystallographic and thermoelectric properties in polycrystalline type-I Ba{sub 8}Ga{sub x}Si{sub 46-x} (nominal x=14-18) clathrates prepared by combining arc melting and spark plasma sintering methods
High Thermoelectric Performance in p-type Polycrystalline Cd-doped SnSe Achieved by a Combination of Cation Vacancies and Localized Lattice Engineering
Related Subjects
THERMOELECTRIC MATERIALS
OPTIMIZATION
SYNTHESIS
BORON ADDITIONS
CARRIER DENSITY
CARRIER MOBILITY
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
GALLIUM PHOSPHIDES
GERMANIUM ALLOYS
MICROSTRUCTURE
PARAMETRIC ANALYSIS
SILICON ALLOYS
SILICON NITRIDES
SPACE POWER REACTORS
THERMAL CONDUCTIVITY
ALLOYS
BORON ALLOYS
GALLIUM COMPOUNDS
MATERIALS
MOBILE REACTORS
MOBILITY
NITRIDES
NITROGEN COMPOUNDS
PHOSPHIDES
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
PNICTIDES
POWER REACTORS
REACTORS
SILICON COMPOUNDS
THERMODYNAMIC PROPERTIES
NESDPS Office of Nuclear Energy Space and Defense Power Systems
300303* - Thermoelectric Generators- Materials
Components
& Auxiliaries