Journal ArticleDOI
Thermal properties of AlAs/GaAs superlattices
TLDR
In this article, the thermal properties of AlAs/GaAs superlattices were measured with the ac calorimetric method and it was found that the thermal diffusivity and thermal conductivity of the AlAs and GaAs super-lattice are larger than those of AlGaAs alloy due to the suppression of alloy scattering in the super lattice.Abstract:
Thermal properties of semiconductor superlattices have been investigated for the first time. The thermal properties of AlAs/GaAs superlattices were measured with the ac calorimetric method. It is found that the thermal diffusivity and thermal conductivity of the AlAs/GaAs superlattices are larger than those of the AlGaAs alloy due to the suppression of alloy scattering in the superlattice. However, the thermal diffusivity and thermal conductivity decrease with a decrease in the superlattice period and seem to approach those of the Al0.5Ga0.5As alloy in the limit of short‐period superlattices.read more
Citations
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Journal ArticleDOI
Complex thermoelectric materials.
TL;DR: A new era of complex thermoelectric materials is approaching because of modern synthesis and characterization techniques, particularly for nanoscale materials, and the strategies used to improve the thermopower and reduce the thermal conductivity are reviewed.
Journal ArticleDOI
Nanoscale thermal transport
David G. Cahill,Wayne K. Ford,Kenneth E. Goodson,Gerald D. Mahan,Arun Majumdar,Humphrey J. Maris,Roberto Merlin,Simon R. Phillpot +7 more
TL;DR: A review of the literature on thermal transport in nanoscale devices can be found in this article, where the authors highlight the recent developments in experiment, theory and computation that have occurred in the past ten years and summarizes the present status of the field.
Journal ArticleDOI
Enhancement of Thermoelectric Figure-of-Merit by a Bulk Nanostructuring Approach
TL;DR: In this paper, the synthesis process and the relationship between the microstructures and the thermoelectric properties of the nanostructured bulk materials with an enhanced ZT value are reviewed.
Journal ArticleDOI
Thermoelectric Materials: New Approaches to an Old Problem
TL;DR: In this paper, it was shown that passing an electric current through the junction in one direction caused the water to freeze, and reversing the current caused the ice to quickly melt; thus thermoelectric refrigeration was demonstrated.
Journal ArticleDOI
Thermal conductivity of Si–Ge superlattices
TL;DR: The thermal conductivity of Si-Ge superlattices with relatively longer periods, L>130 A, has smaller thermal conductivities than the short-period samples.
References
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Journal ArticleDOI
Lattice Thermal Conductivity of Disordered Semiconductor Alloys at High Temperatures
TL;DR: In this paper, the thermal conductivity of disordered semiconductor alloy is derived using the Klemens-Callaway theory, where the reciprocal relaxation times depend on the frequency of strain and mass point defects, and the ratio of umklapp to normal relaxation times.
Journal ArticleDOI
Thermal resistance of heterostructure lasers
W. B. Joyce,R. W. Dixon +1 more
TL;DR: In this article, a GaAs−GaAlAs heterostructure laser is modeled as a stripe heat source embedded in a layered structure, and an analytic expression is given for the steady-state thermal resistance 〈R〉 of the model.
Journal ArticleDOI
Thermal conductivity of silicon, germanium, III–V compounds and III–V alloys
TL;DR: In this paper, the thermal conductivities of mixed III-V compounds: indium arsenide-phosphide, gallium-indium arsenides and gallium antimonides are presented.
Journal ArticleDOI
Thermal diffusivity measurement of thin films by means of an ac calorimetric method
TL;DR: In this paper, a new method to measure thermal diffusivity of a thin sample was developed using a light-irradiated ac calorimetric technique, which can be applied no matter how thin a sample may be.
Journal ArticleDOI
Thermal conductivity of Ga1−xAlxAs alloys
TL;DR: In this article, the authors measured the thermal conductivity of the Ga1−xAlxAs alloy system with LPE layers and found that the thermal resistivity increased with the temperature gradient in the bars with thin films of cholesteric liquid crystals.