We have developed a direct method of measuring the shear strain using a laser-based interferometer. The method was applied to the measurement of the d15 coefficient for wurtzite GaN and A1N. A value for d15 of 3.6 ± 0.2pm V-1 for AIN has been obtained, in good agreement with values quoted in the literature. The value of d15 for GaN has also been measured to be 3.1 ± 0.2pm V-1.
|Number of pages||3|
|Journal||Applied Physics Letters|
|Publication status||Published - 20 Dec 1999|