Nitrogen induced optical phonon shift in GaNyAs1-y studied by Raman Scattering


We present a Raman study of pseudomorphically strained epitaxial films of the ternary alloy GaNyAs1-y grown on GaAs(100) with y ranging from 0 to 0.06. The optical phonon Raman spectrum of the alloy displays a two-mode behavior. The GaAs-like first order modes for y = 0.06 are represented by the strong longitudinal optic (LO1) mode at 287.4 cm−1 and the weaker transverse optic (TO1) mode at 269.0 cm−1, while the GaN-like LO2mode is observed at 475.6 cm−1. Two very broad disorder-induced acoustic bands are evident at 80 and 170 cm−1 due to atomic disorder within the crystalline network. Raman studies show that as the nitrogen concentration in the alloy increases, the GaAs-like LO1band shifts linearly towards lower wavenumber while the linearly increasing GaN-like LO2 phonon band deviates from linearity at higher nitrogen concentration (y ≥ 0.03). The reason for the deviation of the LO2 phonon from linearity is discussed.

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  1. 1

    M. Weyers, M. Sato and T. Ando, Jpn. J. Appl. Phys., part 1 31, L853 (1992)

    CAS  Article  Google Scholar 

  2. 2

    P.Y. Yu and M. Cardona, Fundamentals of semiconductors: physics and material properties, 2nd ed., Springer, 1999

    Google Scholar 

  3. 3

    J.A. Gupta Z.R. Wasilewski, B.J. Riel, J. Ramsey, G.C. Aers, R.L. Williams, G.I. Sproule, A. Perovic, D.D. Perovic, T. Garanzotis and A. J. SpringThorpe, J. Cryst. Growth 242, 141 (2002)

    CAS  Article  Google Scholar 

  4. 4

    D.J. Lockwood, M.W.C. Dharma-wardana, J.-M. Baribeau, and D.C. Houghton, Phys. Rev. B. 35, 2243 (1987)

    CAS  Article  Google Scholar 

  5. 5

    M. Mintairov, P.A. Blagnov, V.G. Melehin, N.N. Faleev, V.M. Tretyakov, J.L. Merz, Y. Qiu, S.A. Nikishin, and H. Temkin, Phys. Rev. B 56, 15836 (1997)

    CAS  Article  Google Scholar 

  6. 6

    T. Prokofyeva, T. Sauncy, M. Seon, M. Holtz, Y. Qiu, S. Nikishin, and H. Temkin, Appl. Phys. Lett., 73, 1409 (1998)

    CAS  Article  Google Scholar 

  7. 7

    H.C. Alt, A.Y. Egorov, H. Riechert, B. Wiedemann, J.D. Meyer, R.W. Michelmann, and K. Bethge, Appl. Phys. Lett. 77, 3331 (2000)

    CAS  Article  Google Scholar 

  8. 8

    M.J. Seong, M.C. Hanna, A. Mascarenhas, Appl. Phys. Lett. 79, 3974 (2001)

    CAS  Article  Google Scholar 

  9. 9

    D. N. Talwar, Physica E, 20, 321 (2004)

    CAS  Article  Google Scholar 

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Correspondence to Li-Lin Tay.

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Tay, LL., Lockwood, D.J. & Gupta, J.A. Nitrogen induced optical phonon shift in GaNyAs1-y studied by Raman Scattering. MRS Online Proceedings Library 829, 72–77 (2004).

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