MOVPE growth and in situ characterization of GaN layers

Hilde Hardtdegen 

Research Center Juelich, Institute of Thin Films and Interfaces (ISG-1), Leo-Brandt-Str, Jülich 52425, Germany

Abstract

Epitaxial growth of GaN layers is a difficult task due to the lack of lattice and thermal expansion matching substrates to GaN. Usually sapphire or SiC and lately also Si (111) wafers are employed with a lattice mismatch of 16, 3.5 and -17 %, and with a thermal mismatch of -34, 25 and 54 %, respectively. Therefore deposition strategies need to be developed which help compensate the mismatch in order to obtain high quality GaN templates for device structures. In this paper first the chemistry of the GaN growth process will be discussed. Then the growth procedure used in MOVPE will be presented. It will be shown how growth parameters influence the characteristics of the layers and how in situ characterization techniques can be used for growth monitoring and optimization. At last methods will be introduced which show how modeling and emission corrected pyrometry can be employed to increase the reproducibilty of the growth process.

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Presentation: invited oral at E-MRS Fall Meeting 2003, Symposium C, by Hilde Hardtdegen
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-09 13:07
Revised:   2009-06-08 12:55
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