Controlling responsivity depends on change of interdigital electrodes in planar MgZnO UV photodetectors

Abstract In this work, the responsivity-controlled high performance UV photodetectors fabricated from MgZnO films was investigated with an emphasis on the effect of varying the number of interdigitated electrode pairs. The responsivity of MgZnO photodetectors was optimized by increasing the number of interdigital electrode pairs at a given bias. The result is due to the parallel structure of the interdigital electrodes and the depletion width of the Schottky junctions. This demonstrates a straightforward way of tailoring the responsivity of UV photodetectors for practical applications.