Figure 4From: Acceptor formation in Mg-doped, indium-rich Ga x In1−xN: evidence for p-type conductivitySchematic of the possible conduction channels in Mg-doped GaInN. (in all the mechanisms the surface layer is n-type degenerate) (a) Bulk layer is p-type. (b) The p-type conductivity occurs in the bulk layer below a certain depth from the surface [20, 29]. (c) The p-type conductivity is not within a uniform layer but occurs through p-type percolation channels [30, 31].Back to article page