Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5449995 | Physica E: Low-dimensional Systems and Nanostructures | 2017 | 7 Pages |
Abstract
The effect of built-in-polarization (BIP) field on thermal properties of InxGa1âxN/GaN heterostructure has been investigated. The thermal conductivity k of InxGa1âxN alloy has been estimated using Callaway's formula including the BIP field for In content x = 0, 0.1, 0.3, 0.5 and 0.9. This study reports that irrespective of In content, the room temperature k of InxGa1âxN/GaN heterostructure is enhanced by BIP field. The result predicts the existence of a characteristic temperature Tp at which both thermal conductivities (including and excluding BIP field) show a crossover. This gives signature of pyroelectric nature of InxGa1âxN alloy which arises due to variation of polarization with temperature indicating that thermal conductivity measurement can reveal pyroelectric nature. The pyroelectric transition temperature of InxGa1âxN alloy has been predicted for various x. The composition dependent nature of room temperature k for x = 0.1 and 0.5 are in line with prior experimental studies. The result can be used to minimize the self heating effect in InxGa1âxN/GaN heterostructures.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
V. Gedam, B.K. Sahoo,