Effect of N isotopic mass on the photoluminescence and cathodoluminescence spectra of gallium nitride |
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Authors: | Email author" target="_blank">F?J?ManjónEmail author M?A?Hernández-Fenollosa B?Marí S?F?Li C?D?Poweleit A?Bell J?Menéndez M?Cardona |
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Institution: | (1) Dpto. de Física Aplicada, Universitat Politécnica de Valéncia, 46071 Valencia, Spain;(2) Department. of Physics and Astronomy, Arizona State University, AZ 85287 Tempe, USA;(3) Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, 70569 Stuttgart, Germany |
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Abstract: | GaN is a wurtzite-type semiconductor at ambient conditions whose natural composition consists of almost pure 14N (99.63% 14N and 0.37% 15N) and a mixture of 60.1% 69Ga, and 39.9% 71Ga. We report a low-temperature photoluminescence and cathodoluminescence study of GaN thin films made from natural Ga and N, and from natural Ga and isotopically pure 15N. The contribution of the nitrogen vibrations to the bandgap renormalization by electron-phonon interaction has been estimated from the nitrogen isotopic mass coefficient of the bound exciton energy. The temperature dependence of the bandgap of GaN can be explained with the measured isotopic mass coefficients of Ga and N. We have estimated the aluminum and indium contribution to the bandgap renormalization in AlN and InN from the temperature dependence of the AlN and InN bandgap up to 300 K, assuming that the N contribution is similar to that found in GaN. The similar bandgap isotopic mass coefficients of C, N, and O, of Al, Si and P, of Zn, Ga and Ge, and of Cd and In suggests that elements of the same row of the periodic table have similar bandgap isotopic mass coefficients.Received: 5 December 2004, Published online: 20 July 2004PACS:
71.20.Nr Semiconductor compounds |
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