AlGaN/GaN MOS-HFETs based on InGaN/GaN MQW structures with Ta2O5 dielectric K.H. Lee, P.C. Chang, S.J. Chang and Y.C. Yin Eur. Phys. J. Appl. Phys., 57 3 (2012) 30102 Published online: 01 March 2012 DOI: 10.1051/epjap/2012110271