Temperature-dependent exciton resonance energies and their correlation with IR-active optical phonon modes in β-Ga2O3 single crystals
T Onuma, S Saito, K Sasaki, K Goto, T Masui… - Applied Physics …, 2016 - pubs.aip.org
Temperature-dependent exciton resonance energies Eexciton in b-Ga2O3 single crystals
are studied by using polarized reflectance measurement. The Eexciton values exhibit large
energy changes in the range of 179–268meV from 5 to 300K. The IR-active Au and Bu
optical phonon modes are selectively observed in the IR spectroscopic ellipsometry spectra
by reflecting the polarization selection rules. The longitudinal optical (LO) phonon energies
can be divided into three ranges: hxLO ¼35–48, 70–73, and 88–99meV. The broadening …
are studied by using polarized reflectance measurement. The Eexciton values exhibit large
energy changes in the range of 179–268meV from 5 to 300K. The IR-active Au and Bu
optical phonon modes are selectively observed in the IR spectroscopic ellipsometry spectra
by reflecting the polarization selection rules. The longitudinal optical (LO) phonon energies
can be divided into three ranges: hxLO ¼35–48, 70–73, and 88–99meV. The broadening …
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