LOCAL STRUCTURE IN InGaAsP QUATERNARY ALLOYSReport as inadecuate




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Abstract : The local structure of InGaAsP quaternary alloys epitaxially grown on InP substrates has been studied by EXAFS and near-edge structure. The bimodal distribution of bondlength at both cation In, Ga and anion As, P sites were confirmed. The bondlengths were found to deviate from the VCA average by 2.4-5.5 % whereas they deviate from those in pure binary compounds by only 0.9-1.6 %. These deviations were found to be constant within 0.4 % over a wide range of composition when the VCA average is kept constant. Two cation species Ga, In and anion species As, P are expected to be randomly distributed on each sublattices. The average interatomic distance calculated from the weighted sum of bondlengths agrees the VCA average over a wide range of alloy composition. These results imply that lattice relaxation of lattice-matched quaternary alloys can be realized by only bond-bending.





Author: H. Oyanagi Y. Takeda T. Matsushita T. Ishiguro A. Sasaki

Source: https://hal.archives-ouvertes.fr/



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