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Compositional dependence of longitudinal sound velocities of piezoelectric (111) InxGa(1−x)As measured by picosecond ultrasonics

Authors :
Yu-Chieh Wen
Li-Chang Chou
Chi-Kuang Sun
Tzeng-Fu Kao
Hao-Hsiung Lin
Kung-Hsuan Lin
Source :
Journal of Applied Physics. 100:103516
Publication Year :
2006
Publisher :
AIP Publishing, 2006.

Abstract

Picosecond ultrasonic experiments were performed to generate and detect acoustic pulses in piezoelectric (111) epilayers of InxGa(1−x)As, and the longitudinal sound velocities in the [111] direction of InxGa(1−x)As were thus directly determined by controlling the indium content x. We found that the sound velocity exhibits an obvious bowing with different alloy compositions and can be described as a quadratic function of VL(x)=458x2−1451x+5414. This result supports a nonlinear compositional dependence of the elastic constants of InxGa(1−x)As and indicates that the linear-interpolation approximation is inapplicable for estimating sound velocity in this specific case.

Details

ISSN :
10897550 and 00218979
Volume :
100
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........727c9fd72f7f0e75d222a4036e45ad46