Observation of a manganese acceptor level in ferromagnetic Ga1-x Mnx N layers

I. T. Yoon, T. W. Kang, M. C. Jeong, M. H. Ham, J. M. Myoung

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Abstract

We have observed the high-temperature (T=300 K) photoluminescence (PL) spectra from free to Mn-related acceptor pair transitions in Ga1-x Mnx N layers (where x≈0.2%-0.6%) grown on sapphire (0001) substrates using the plasma-enhanced molecular-beam epitaxy technique. Luminescence from an Mn acceptor level in Ga1-x Mnx N layer with a low Mn content was observed at around E=3.08 eV in the PL spectra. When compared to the PL from undoped GaN, the excitation, temperature-dependent PL at E=3.08 eV provides convincing evidence for a neutral Mn acceptor-bound hole character. The binding energy of the Mn acceptor-bound holes of E=330 meV is in good agreement with an ionization energy of E=402 meV obtained using effective mass theory of shallow impurity states for the hydrogen model. In addition, analysis of the PL intensities of an acceptor-bound hole in a Ga1-x Mnx N layer with x≈0.6% gave an activation energy of E=310 meV, which indicates that the acceptor-bound hole with a binding energy of E=310 meV was dissociated due to thermal quenching.

Original languageEnglish
Pages (from-to)4878-4880
Number of pages3
JournalApplied Physics Letters
Volume85
Issue number21
DOIs
Publication statusPublished - 2004 Nov 1

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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