Fig. 2
From: Two-step deposition of Al-doped ZnO on p-GaN to form ohmic contacts
a The sketch graphs demonstrating van der pauw geometry. b The resistivity of AZO films with different growth temperatures (500, 600, 700 and 800 °C). The inner graph of (b) shows the temperature dependence of the resistivity. c Current-voltage characteristics of different mole ratios of Al to Zn. d The resistivity and carrier density vs different mole ratios of Al to Zn