Carbon atomic layer doping in algaas by metalorganic chemical vapor deposition and its application to a p-type modulation doped structure

Toshiki Makimoto, Naoki Kobayashi

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Carbon (C) atomic layer doping in AlGaAs is demonstrated. During undoped AlGaAs growth by conventional low-pressure metalorganic chemical vapor deposition, C atomic layer doping is performed by supplying trimethylgallium onto AlGaAs surfaces under arsine-free conditions. C incorporation increases with increasing Al composition of the surface layer onto which trimethylgallium is supplied, suggesting that the C incorporation mechanism is that As atoms of the AlGaAs surface are partially replaced by C atoms of methyl groups to become acceptors. The capacitance-voltage measurement of the C atomic layer doped AlGaAs shows a carrier profile with a full width at half-maximum as narrow as 8.0 nm at a peak carrier concentration of 2.1ȕ1018 cm-3, indicating that the diffusion of C atoms in AlGaAs is not serious during growth at 610ŶC. A p-type modulation doped AlGaAs/GaAs structure was fabricated using C atomic layer doping, and a mobility of 1.3ȕ105 cm2/Vƃs was obtained at 1.5 K for a sheet hole density of 3.9ȕ1011 cm-2 Because of the high quality two-dimensional hole gas, a region limited by acoustic phonon scattering can be seen in the temperature dependence of hole mobility.

Original languageEnglish
Pages (from-to)L1300
JournalJapanese Journal of Applied Physics
Issue number7
Publication statusPublished - 1993
Externally publishedYes


ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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