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Calculation of Unstable Mixing Region In Wurtzite InGaN

Published online by Cambridge University Press:  10 February 2011

Toru Takayama ,
Tetsuzo Ueda ,
Masahiro Ishida ,
Masaaki Yuri ,
Kunio Itoh ,
Takaaki Baba  and
James S. Harris Jr
Toru Takayama
Affiliation:
Solid State Electronics Laboratory, CIS-X329, Stanford University, Stanford, CA94305-4075 Electronics Research Laboratory, Matsushita Electronics Corporation, 1-1 Saiwaicho, Takatsuki, Osaka, 569, Japan
Tetsuzo Ueda
Affiliation:
Solid State Electronics Laboratory, CIS-X329, Stanford University, Stanford, CA94305-4075 Electronics Research Laboratory, Matsushita Electronics Corporation, 1-1 Saiwaicho, Takatsuki, Osaka, 569, Japan
Masahiro Ishida
Affiliation:
Electronics Research Laboratory, Matsushita Electronics Corporation, 1-1 Saiwaicho, Takatsuki, Osaka, 569, Japan
Masaaki Yuri
Affiliation:
Solid State Electronics Laboratory, CIS-X329, Stanford University, Stanford, CA94305-4075 Electronics Research Laboratory, Matsushita Electronics Corporation, 1-1 Saiwaicho, Takatsuki, Osaka, 569, Japan
Kunio Itoh
Affiliation:
Electronics Research Laboratory, Matsushita Electronics Corporation, 1-1 Saiwaicho, Takatsuki, Osaka, 569, Japan
Takaaki Baba
Affiliation:
Electronics Research Laboratory, Matsushita Electronics Corporation, 1-1 Saiwaicho, Takatsuki, Osaka, 569, Japan
James S. Harris Jr
Affiliation:
Solid State Electronics Laboratory, CIS-X329, Stanford University, Stanford, CA94305-4075
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Abstract

The InGaN ternary system, which is useful for blue and green light emitting or laser diodes, is studied with respect to an unstable mixing region in the phase field. The unstable region is analyzed using a strictly regular solution model. The interaction parameter used in the analysis is obtained from a strain energy calculation using the valence force field model, modified for both wurtzite and zinc-blende structures to avoid overestimation of the strain energy. The structural deviation from an ideal wurtzite structure in GaN and InN is also taken into account in our model. The interaction parameters of InGaN obtained by our analysis for the wurtzite and zinc-blende structures are 7.81 kcal/mol and 6.63 kcal/mol, respectively. According to the calculated results of the interaction parameters, the critical temperature for wurtzite InGaN and zinc-blende InGaN are found to be 1967 K and 1668 K, respectively. This suggests that, at a typical growth temperature of 800°C, a wide unstable mixing region exists in both wurtzite and zinc-blende structures. In order to show the validity of our calculation results, we compare the calculated results and the experimental results using the calculation of the interaction parameter for the InGaAs system. The calculated results agree well with the experimental results.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 512: Symposium F – Wide Bandgap Semiconductors for High Power, High Frequency , 1998 , 291
Copyright
Copyright © Materials Research Society 1998

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References

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