Raman Studies of GaNP Alloy
2002 (English)Conference paper (Refereed)
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-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.
Place, publisher, year, edition, pages
Materials Research Society Symposium - Proceedings, Vol. 693: MRS , 2002. 303- p.
National CategoryNatural Sciences
IdentifiersURN: urn:nbn:se:liu:diva-45100Local ID: 79672OAI: oai:DiVA.org:liu-45100DiVA: diva2:265962