Raman Spectral Behavior of In_1-xGa_xP (0<x<1)

Abstract

We report on a Raman study of In1-x Ga x P over the whole range of alloy compositions, x. The additional peak, which appeared for x\lesssim0.98 and about which various interpretations have been proposed, is found to be constructed by two unresolved modes. The Raman spectra indicate that this alloy system has a modified two-mode behavior. The spectral half width of a TO mode broadened in the middle of the alloy composition. This is partly due to the strong two-acoustic-phonons scattering process.

Phonon modes in spontaneously orderedGaInP2studied by micro-Raman scattering measurements

“…In addition, it is believed that there is a TOphonon peak between the two LO-phonon peaks. 11,12 In early Raman studies on the effects of ordering, no major change in the Raman spectrum was observed. With recent improvement in the sample qualities, however, there have been several reports 7-10 of major effects of ordering on the ͑001͒ Raman spectrum.…”

Percolation model for long wave phonons in random zincblende alloys: from II‐VI's to III‐V's

“…Now we turn to the GaP:In impurity mode. Kato et al [9] observed a quasi-degenerate TO-LO mode at ~390 cm -1 in the In-dilute limit of (Ga,In)P, which they assigned as the GaP:In impurity mode. Since then the question of the location of the GaP:In mode was not re-examined.…”

“…at ~347 cm -1 [8], the GaP:In mode was identified within the GaP TO-LO band, i.e. at ~390 cm -1 [9]. This is taken as responsible for strong overlapping of the Ga-P and In-P bands in the alloy, resulting in a complicated phonon behavior [10].…”

Far-Infrared dielectric anisotropy and phonon modes in spontaneously CuPt-orderedGa0.52In0.48P

“…[1][2][3][4][5][6][7] For ternary alloys a distinction was made so far between the two extreme where infrared-active phonon mode frequencies vary as a function of the alloy composition: A single band of transverse ͑TO͒ and longitudinal ͑LO͒ phonon modes, which shift continuously between those of the binary constituents, and which is commonly termed as ''one-mode'' behavior. Accordingly, for the ''twomode'' behavior, two infrared active phonon bands occur close to the frequencies of the binary constituents.…”