Polarization field engineering of GaN/AlN/AlGaN superlattices for enhanced thermoelectric properties
- Materials Department, University of California, Santa Barbara, California 93106 (United States)
A novel polarization field engineering based strategy to simultaneously achieve high electrical conductivity and low thermal conductivity in thermoelectric materials is demonstrated. Polarization based electric fields are used to confine electrons into two-dimensional electron gases in GaN/AlN/Al{sub 0.2}Ga{sub 0.8}N superlattices, resulting in improved electron mobilities as high as 1176 cm{sup 2}/Vs and in-plane thermal conductivity as low as 8.9 W/mK. The resulting room temperature ZT values reach 0.08, a factor of four higher than InGaN and twelve higher than GaN, demonstrating the potential benefits of this polarization based engineering strategy for improving the ZT and efficiencies of thermoelectric materials.
- OSTI ID:
- 22280559
- Journal Information:
- Applied Physics Letters, Vol. 104, Issue 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
Tuning Electrical and Thermal Transport in AlGaN/GaN Heterostructures via Buffer Layer Engineering
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journal | March 2018 |
Computationally predicted energies and properties of defects in GaN
|
journal | March 2017 |
Thermoelectric properties of In-rich InGaN and InN/InGaN superlattices
|
journal | April 2016 |
Built-in-polarization field effect on intrinsic and extrinsic thermal conductivities of AlN/GaN/AlN quantum well
|
journal | August 2015 |
| Tuning Electrical and Thermal Transport in AlGaN/GaN Heterostructures via Buffer Layer Engineering | preprint | January 2017 |
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM NITRIDES
ELECTRIC CONDUCTIVITY
ELECTRIC FIELDS
ELECTRON MOBILITY
ELECTRONS
GALLIUM NITRIDES
HETEROJUNCTIONS
INTERFACES
POLARIZATION
SUPERLATTICES
TEMPERATURE RANGE 0273-0400 K
THERMAL CONDUCTIVITY
THERMOELECTRIC MATERIALS
THERMOELECTRIC PROPERTIES