Data for reference menniger-prb-53-1881

Identification of optical transitions in cubic and hexagonal GaN by spatially resolved cathodoluminescence

J. Menniger, U. Jahn, O. Brandt, H. Yang, K. Ploog

Physical Review B 53(4), 1881 (1996).

The hexagonal and cubic phases of GaN are characterized by spatially resolved cathodoluminescence (CL) spectra from micrometer- size single crystals with either hexagonal or cubic habits grown by plasma-assisted molecular-beam epitaxy. At 5 K, distinct narrow excitonic lines are found at 3.472 and 3.272 eV for the hexagonal and cubic phase, yielding energy gaps of 3.500 and 3.300 eV, respectively. Detailed temperature- and intensity-dependent CL measurements on cubic GaN crystals enable us to clearly identify the exciton (free: 3.272 eV, bound: 3.263 eV) and the donor-acceptor pair (3.150 eV) transition. Moreover, we determine the donor-band and acceptor-band transition energy for this phase. In addition, phonon replicas of the exciton line and of the donor-acceptor pair transition are observed at 3.185 and 3.064 eV, respectively.

This item is cited by the following items in the database:

  1. Identification of a Cubic Phase in Epitaxial Layers of Predominantly Hexagonal GaN
  2. Photoluminescence of Strain-Engineered MBE-Grown GaN and InGaN Quantum-Well Structures
  3. Morphology and optical properties of cubic phase GaN epilayers grown on (001) Si

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