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- Title
Macroscopic Polarization Effect on Bowing Constant of Thermal Parameters of InGaN.
- Authors
Gedam, V.; Pansari, A.; Sahoo, B.
- Abstract
In this work, we have investigated theoretically the effect of macroscopic polarization [sum of spontaneous (SP) and piezoelectric (PZ) polarization] on various physical parameters of InGaN alloy. The macroscopic polarization contributes to the effective elastic constants of InGaN alloy. This modifies the phonon group velocity, Debye temperature, and Debye frequency of the alloy. These thermal parameters are estimated as a function of In composition. Our calculation shows that these material parameters are enhanced and vary nonlinearly with In composition, i.e., show bowing. The cause of bowing is the nonlinear dependence of the spontaneous and piezoelectric polarization on composition. The bowing constant of each material parameter (with and without polarization) is also theoretically predicted by the best-fit method. The results show that the polarization mechanism not only enhances the parameters but also contributes significantly to the bowing constant. The macroscopic polarization contributes more than 25% to the bowing constant. The obtained results can be used to predict the effect of the polarization mechanism on the thermoelectric properties of InGaN alloy.
- Subjects
POLARIZATION (Electrochemistry); PIEZOELECTRICITY; GALLIUM nitride; ELECTRIC properties of gallium nitride; ELECTRONIC materials; THERMAL properties
- Publication
Journal of Electronic Materials, 2015, Vol 44, Issue 4, p1035
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-014-3615-2