Construction of ZnSe–ZnO axial p–n junctions via regioselective oxidation process and their photo-detection applications

Single ZnSe–ZnO nanowire axial p–n junction was fabricated by regioselectively oxidizing the p-type ZnSe NW in air. Pronounced current rectification behavior with on/off ratio of ∼50 and ideality factor of ∼1.7 were presented. The axial p–n junction also exhibited high sensitivity to UV light . A high performance UV light photodetector with a responsibility of ∼0.67   ×   10 4   A   W −1 , a gain of ∼2.3   ×   10 4 and a detectivity of ∼4.1   ×   10 13   cm   Hz 1/2   W −1 were elucidated based on this axial p–n junction. This new method is expected to construct more nano-devices based on one-dimensional semiconductor nanostructures.