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JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 56, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.7567/JJAP.56.058004
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We theoretically investigate the piezoelectric properties of Mg-Nb codoped wurtzite AlN by first-principles calculations and find the following two points. First, doping induces a remarkable softening of elastic constants, especially the diagonal component along the c-axis. This results in the increased piezoelectric strain constant d(33), which is about 4.3 times larger than that of wurtzite AlN. Second, the c-axis lattice length increases up to the dopant concentration of around 60 at.%, and then decreases. These features are in excellent agreement with the experimental results previously reported. (C) 2017 The Japan Society of Applied Physics
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