Hello everyone, Here i have metal-semiconductor-metal (M-S-M) junctions, p-type semiconductor separating two similar metals. In above picture semiconductor forming schottky barriers with metals, While in below picture these are ohmic contacts.. If assume that the semiconductor is very thin(few nanometers) and proper biasing is applied, Then is it possible for the electrons to tunnel directly from metal to metal..?? Or is there any indirect tunneling paths.? Any answers would be greatly appreciated!