Dielectric and polar properties of aluminum nitride single crystals

Abstract

Abstract The results of the dielectric, pyroelectric, and piezoelectric studies of aluminum nitride single crystals are presented in this paper. The crystals were grown by sublimation and hybrid-chloride vapor phase epitaxy, which provided high growth rates, large sizes, and the ability to reduce structural defects. The pyroelectric effect measurements by a dynamic method using infrared laser radiation (λ\u2009=\u2009980\u2009nm) revealed high values of the pyroelectric coefficient up to 30 µC/(m2K). The piezoelectric coefficient d 31 was found about 1.6⋅10−12 m/V.