Contact barriers in a single ZnO nanowire device

초록

The contact potential between a single ZnO nanowire and Ti/Au contacts was estimated to be similar to 30 meV by considering the Arrhenious plot of the two-probe resistance, the thermionic emission conduction, and the Fowler-Nordheim tunneling model. The net voltages applied to the contacts were calculated by subtracting the four-probe voltages from the two-probe voltages at the same currents. The activation energy of the four-probe resistance was about 2.4mV which was 1/11th of that of the two-probe resistance. The Fowler-Nordheim plot clearly showed the crossover of the conduction mechanism from thermionic emission to tunneling regime as lowering the temperatures below T < 100 K.

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