GaN on Sapphire for Power. PAM XIAMEN offers GaN on Sapphire for Power. 1.1 GaN HEMT Structure on Sapphire for Power Application Wafer size 2", 3", 4", 6" AlGaN/GaN HEMT structure Refer 1.2 Carrier density 6E12~2E13 cm2 Hall mobility / XRD(102)FWHM ~arc.sec XRD(002)FWHM ~arc.sec Sheet Resistivity / AFM RMS …