Abstract
Room temperature infrared (IR) optical responses of wurtzite indium gallium nitride (InxGa1 - xN) in the composition range of 0.174 ≤ x ≤ 0.883 were investigated by the polarized IR reflectance spectroscopy. Analyses of the amplitudes of oscillation fringes in the non-reststrahlen region revealed that the high frequency dielectric constants of the samples were unusually smaller than the values predicted from the Clausius-Mossotti relation. This odd behavior was attributed to the porous surface morphology of the InxGa1 - xN samples. The E1 optical phonon modes of the InxGa1 - xN were deduced from the composition dependent reststrahlen features. The obtained values were compared to those calculated through the modified random element iso-displacement (MREI) model. The deviation between the measured data and the MREI model prediction were explained in detail from the aspects of strain, thermal expansion and anharmonic phonon-coupling. Finally, it was found that the large discrepancy of the E1(LO) mode is mainly attributed to the effects of the longitudinal phonon-plasmon coupling.
| Original language | English |
|---|---|
| Pages (from-to) | 334-341 |
| Number of pages | 8 |
| Journal | Thin Solid Films |
| Volume | 603 |
| DOIs | |
| Publication status | Published - 2016 Mar 31 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Metals and Alloys
- Materials Chemistry
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Infrared optical responses of wurtzite InxGa1 - XN thin films with porous surface morphology. / Yew, P.; Lee, S. C.; Ng, S. S.; Hassan, H. Abu; Chen, W. L.; Osipowicz, T.; Ren, M. Q.
In: Thin Solid Films, Vol. 603, 31.03.2016, p. 334-341.Research output: Contribution to journal › Article
TY - JOUR
T1 - Infrared optical responses of wurtzite InxGa1 - XN thin films with porous surface morphology
AU - Yew, P.
AU - Lee, S. C.
AU - Ng, S. S.
AU - Hassan, H. Abu
AU - Chen, W. L.
AU - Osipowicz, T.
AU - Ren, M. Q.
PY - 2016/3/31
Y1 - 2016/3/31
N2 - Room temperature infrared (IR) optical responses of wurtzite indium gallium nitride (InxGa1 - xN) in the composition range of 0.174 ≤ x ≤ 0.883 were investigated by the polarized IR reflectance spectroscopy. Analyses of the amplitudes of oscillation fringes in the non-reststrahlen region revealed that the high frequency dielectric constants of the samples were unusually smaller than the values predicted from the Clausius-Mossotti relation. This odd behavior was attributed to the porous surface morphology of the InxGa1 - xN samples. The E1 optical phonon modes of the InxGa1 - xN were deduced from the composition dependent reststrahlen features. The obtained values were compared to those calculated through the modified random element iso-displacement (MREI) model. The deviation between the measured data and the MREI model prediction were explained in detail from the aspects of strain, thermal expansion and anharmonic phonon-coupling. Finally, it was found that the large discrepancy of the E1(LO) mode is mainly attributed to the effects of the longitudinal phonon-plasmon coupling.
AB - Room temperature infrared (IR) optical responses of wurtzite indium gallium nitride (InxGa1 - xN) in the composition range of 0.174 ≤ x ≤ 0.883 were investigated by the polarized IR reflectance spectroscopy. Analyses of the amplitudes of oscillation fringes in the non-reststrahlen region revealed that the high frequency dielectric constants of the samples were unusually smaller than the values predicted from the Clausius-Mossotti relation. This odd behavior was attributed to the porous surface morphology of the InxGa1 - xN samples. The E1 optical phonon modes of the InxGa1 - xN were deduced from the composition dependent reststrahlen features. The obtained values were compared to those calculated through the modified random element iso-displacement (MREI) model. The deviation between the measured data and the MREI model prediction were explained in detail from the aspects of strain, thermal expansion and anharmonic phonon-coupling. Finally, it was found that the large discrepancy of the E1(LO) mode is mainly attributed to the effects of the longitudinal phonon-plasmon coupling.
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U2 - 10.1016/j.tsf.2016.02.039
DO - 10.1016/j.tsf.2016.02.039
M3 - Article
AN - SCOPUS:84960893840
VL - 603
SP - 334
EP - 341
JO - Thin Solid Films
JF - Thin Solid Films
SN - 0040-6090
ER -