Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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The Effects of Codoping of Be and Mg on Incorporation of Mn in GaAs

  • Yu, Fucheng (School of Nano Science and Technology, Chungnam National University) ;
  • Gao, Cunxu (School of Nano Science and Technology, Chungnam National University) ;
  • Parchinskiy, P.B. (School of Nano Science and Technology, Chungnam National University) ;
  • Chandra, Sekar.P.V. (School of Nano Science and Technology, Chungnam National University) ;
  • Kim, Do-Jin (School of Nano Science and Technology, Chungnam National University) ;
  • Kim, Chang-Soo (Korea Research Institute of Standards and Science) ;
  • Kim, Hyo-Jin (School of Nano Science and Technology, Chungnam National University) ;
  • Ihm, Young-Eon (School of Nano Science and Technology, Chungnam National University)
  • Published : 2008.08.31
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Abstract

Samples of GaMnAs, GaMnAs codoped with Be, and GaMnAs simultaneously codoped with Be and Mg were grown via low-temperature molecular beam epitaxy (LT-MBE). Be codoping is shown to take the Ga sites into the lattice efficiently and to increase the conductivity of GaMnAs. Additionally, it shifts the semiconducting behavior of GaMnAs to metallic while the Mn concentration in the GaMnAs solid solution is reduced. However, with simultaneous codoping of GaMnAs with Be and Mg, the Mn concentration increases dramatically several times over that in a GaMnAs sample alone. Mg and Be are shown to eject Mn from the Ga sites to form MnAs and MnGa precipitates.

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