Raman studies of GaNP alloy

I. A. Buyanova; W. M. Chen; E. M. Goldys; H. P. Xin; C. W. Tu

Raman studies of GaNP alloy

I. A. Buyanova, W. M. Chen, E. M. Goldys, H. P. Xin, C. W. Tu

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Abstract

Raman scattering (RS) spectroscopy is employed to characterize the effect of nitrogen on structural properties of GaN_xP_1-x alloy with nitrogen composition up to 3%. Two-mode behavior of the alloy is clearly shown. The frequency of the GaP-like LO phonons is found to decrease with N composition as -1.13 cm^-1 x. This dependence is proposed to be largely due to the biaxial strain in the GaNP epilayers, as a result of lattice mismatch to the GaP substrate. The frequency of the GaN-like phonons is found to be more sensitive to nitrogen content, increasing with the rate of +2.6 cm^-1 x. The addition of nitrogen is also found to cause a dramatic quenching of the two-phonon Raman scattering and an appearance of the zone edge GaP-like vibrations. These effects are suggested to reflect local distortion in the GaNP lattice induced by nitrogen, as well as possible clustering of N atoms.

Original language	English
Pages (from-to)	303-308
Number of pages	6
Journal	Materials Research Society Symposium - Proceedings
Volume	693
Publication status	Published - 2002
Externally published	Yes

Cite this

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title = "Raman studies of GaNP alloy",

abstract = "Raman scattering (RS) spectroscopy is employed to characterize the effect of nitrogen on structural properties of GaNxP1-x alloy with nitrogen composition up to 3%. Two-mode behavior of the alloy is clearly shown. The frequency of the GaP-like LO phonons is found to decrease with N composition as -1.13 cm-1 x. This dependence is proposed to be largely due to the biaxial strain in the GaNP epilayers, as a result of lattice mismatch to the GaP substrate. The frequency of the GaN-like phonons is found to be more sensitive to nitrogen content, increasing with the rate of +2.6 cm-1 x. The addition of nitrogen is also found to cause a dramatic quenching of the two-phonon Raman scattering and an appearance of the zone edge GaP-like vibrations. These effects are suggested to reflect local distortion in the GaNP lattice induced by nitrogen, as well as possible clustering of N atoms.",

author = "Buyanova, {I. A.} and Chen, {W. M.} and Goldys, {E. M.} and Xin, {H. P.} and Tu, {C. W.}",

year = "2002",

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pages = "303--308",

journal = "Materials Research Society Symposium - Proceedings",

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TY - JOUR

T1 - Raman studies of GaNP alloy

AU - Buyanova, I. A.

AU - Chen, W. M.

AU - Goldys, E. M.

AU - Xin, H. P.

AU - Tu, C. W.

PY - 2002

Y1 - 2002

N2 - Raman scattering (RS) spectroscopy is employed to characterize the effect of nitrogen on structural properties of GaNxP1-x alloy with nitrogen composition up to 3%. Two-mode behavior of the alloy is clearly shown. The frequency of the GaP-like LO phonons is found to decrease with N composition as -1.13 cm-1 x. This dependence is proposed to be largely due to the biaxial strain in the GaNP epilayers, as a result of lattice mismatch to the GaP substrate. The frequency of the GaN-like phonons is found to be more sensitive to nitrogen content, increasing with the rate of +2.6 cm-1 x. The addition of nitrogen is also found to cause a dramatic quenching of the two-phonon Raman scattering and an appearance of the zone edge GaP-like vibrations. These effects are suggested to reflect local distortion in the GaNP lattice induced by nitrogen, as well as possible clustering of N atoms.

AB - Raman scattering (RS) spectroscopy is employed to characterize the effect of nitrogen on structural properties of GaNxP1-x alloy with nitrogen composition up to 3%. Two-mode behavior of the alloy is clearly shown. The frequency of the GaP-like LO phonons is found to decrease with N composition as -1.13 cm-1 x. This dependence is proposed to be largely due to the biaxial strain in the GaNP epilayers, as a result of lattice mismatch to the GaP substrate. The frequency of the GaN-like phonons is found to be more sensitive to nitrogen content, increasing with the rate of +2.6 cm-1 x. The addition of nitrogen is also found to cause a dramatic quenching of the two-phonon Raman scattering and an appearance of the zone edge GaP-like vibrations. These effects are suggested to reflect local distortion in the GaNP lattice induced by nitrogen, as well as possible clustering of N atoms.

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M3 - Article

AN - SCOPUS:0036374075

SN - 0272-9172

VL - 693

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EP - 308

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

ER -

Raman studies of GaNP alloy

Abstract

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