Published online by Cambridge University Press: 03 September 2012
Low-temperature (LT-) AlN interlayer reduces tensile stress during growth of Alx Ga1−x N, while simultaneously acts as the dislocation filter, especially for dislocations of which Burger's vector contains [0001] components. UV photodetectors using thus-grown high quality Alx Ga1−x N layers were fabricated. The dark current bellow 50 fA at 10 V bias for 10 [.mu]m strip allowing a photocurrent to dark current ratio greater than one even at 40 nW/cm2 have been achieved.