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Raman Studies of GaNP Alloy

  • I. A. Buyanova (a1), W. M. Chen (a1), E. M. Goldys (a2), H. P. Xin (a2) and C. W. Tu (a2)...

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-1x. 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-1x. 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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Raman Studies of GaNP Alloy

  • I. A. Buyanova (a1), W. M. Chen (a1), E. M. Goldys (a2), H. P. Xin (a2) and C. W. Tu (a2)...

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