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Time-resolved cathodoluminescence and photocurrent study of the yellow band in Si-doped GaN

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Díaz-Guerra Viejo, Carlos and Piqueras de Noriega, Javier and Castaldini, A. and Cavallini, A. and Polenta, L. (2003) Time-resolved cathodoluminescence and photocurrent study of the yellow band in Si-doped GaN. Journal of Applied Physics, 94 (4). pp. 2341-2346. ISSN 0021-8979

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Official URL: http://dx.doi.org/10.1063/1.1592296


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Abstract

Time-resolved cathodoluminescence (TRCL) and photocurrent (PC) spectroscopies have been applied to the study of the yellow band of Si-doped GaN. Measurements carried out combining both techniques unambiguously reveal the complex nature of this broad emission and confirm that different deep defect levels are involved in the observed luminescence. Five emission bands centered at 1.89, 2.03, 2.16, 2.29, and 2.38 eV were found by steady state and time-resolved CL investigations, while PC spectra showed four transitions at about 2.01, 2.14, 2.28, and 2.43 eV. The behavior of the deep-level emissions intensity as a function of the excitation pulse width as well as their decay times were investigated by TRCL. A decay time of 245 mus was measured for the 2.29 eV emission band, while longer decay times of 315 and 340 mus were found, respectively, for the 2.16 and 2.38 eV bands, in agreement with TRCL spectra. The appearance of the 2.03, 2.16, 2.29 eV and 2.38-2.43 eV peaks both in PC and CL spectra suggests that these bands are related to deep acceptor to band transitions, as supported by the single exponential character of the corresponding decay transients.


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© 2003 American Institute of Physics.
The authors wish to thank D. C. Look, H. Morkoc¸ and J. van Nostrand for providing the investigated material. C. D.-G. acknowledges M. E. C. D. for a postdoctoral research grant. This work has been partially supported by MCYT through Project No. MAT2000-2119.

Uncontrolled Keywords:Chemical-Vapor-Deposition, Freestanding Gan, Epitaxial-Films, Luminescence, Photoluminescence, Excitation, Vacancies, Energies, Donors, Layers
Subjects:Sciences > Physics > Materials
ID Code:26241
Deposited On:15 Jul 2014 11:19
Last Modified:15 Jul 2014 11:19

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