J. Phys. IV France 125 (2005) 205-208
Effects of substrate nitridation time on the thermal properties of GaN films grown on silicon by molecular beam epitaxyM. Cervantes-Contreras1, M. López-López2, G. González de la Cruz2, P. Rodríguez2, M. Tamura2 and T. Yodo2
1 Departamento de Matemáticas UPIBI-IPN Acueducto de Guadalupe, Mexico, DF
2 Departamento de Fisica, CINVESTAV- IPN, Apdo Postal 14-740, 07000 Mexico, DF
In this work the structural and thermal properties of GaN films grown on Si substrates with different nitridation times have been investigated. We found an optimal nitridation time for which the GaN crystal qualtity can be improved. On the other hand, effective thermal conductivity of the GaN/Si system was obtained using the photoacoustic technique and from these results the nitridation time dependence of the interface thermal conductivity can be evaluated using the two-layer model. The variation of the interface thermal conductivity for different nitridation times can be associated with the interface phonon scattering process by the presence of disorder at the interface of the GaN/Si heterostructure.
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