Decrease in the binding energy of donors in heavily doped GaN:Si layers View Full Text


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Article Info

DATE

2014-08-31

AUTHORS

I. V. Osinnykh, K. S. Zhuravlev, T. V. Malin, B. Ya. Ber, D. Yu. Kazantsev

ABSTRACT

The properties of Si-doped GaN layers grown by molecular-beam epitaxy from ammonia are studied by photoluminescence spectroscopy. It is shown that the low-temperature photoluminescence is due to the recombination of excitons bound to donors at Si-atom concentrations below 1019 cm−3. At a Si-atom concentration of 1.6 × 1019 cm−3, the band of free excitons is dominant in the photoluminescence spectrum; in more heavily doped layers, the interband recombination band is dominant. A reduction in the binding energy of exciton-donor complexes with increasing doping level is observed. With the use of Haynes rule, whereby the binding energy of the complex in GaN is 0.2 of the donor ionization energy ED, it is shown that ED decreases with increasing Si concentration. This effect is described by the dependence {ie1134-1}, where EDotp is the ionization energy of an individual Si atom in GaN. The coefficient that describes a decrease in the depth of the impurity-band edge with increasing Si concentration is found to be α = 8.4 × 10−6 meV cm−1. More... »

PAGES

1134-1138

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s1063782614090176

DOI

http://dx.doi.org/10.1134/s1063782614090176

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1017105275


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