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1 Opto-Electronics Review

1 2002

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Recent advances in gate dielectrics and polarised light emission from GaN

Pearton S. J., Abernathy C. R., Gila B. P., Onstine A. H., Overberg M. E., Thaler G. T., Jihyun K., Luo B., Mehandru R., Ren F., Park Y. D.

Opto-Electronics Review

2002

Vol. 10, No. 4

231-236

Inversion behaviour has been demonstrated in gate-controlled p-GaN diodes using both MgO and Sc₂O₃ gate dielectrics and implanted n⁺ regions to provide a source of inversion charge. The total surface state density was estimated from capacitance-voltage or charge pumping measurements to be in the range 3 - 8 x 10¹² cm² after the implant activation annealing to form the source and drain regions. In addition, Mn doping of GaN during growth by molecular beam epitaxy is found to produce room temperature ferromagnetism under conditions where the material remains single-phase. The layers can be used as injectors of spin-polarised carriers into light-emitting diode structures, with the potential for creating polarised optical output.