Dual-band ultraviolet photodetectors comprising nanostructured MgZnO on ZnO films

To extend the wavelength sensing limitation, dual-band ultraviolet photodetectors (UV-PDs) were studied. The ZnO/MgZnO dual-band UV-PDs were constructed by stacking MgZnO nanorods on ZnO films. The wide ultraviolet wavelength from 250 to 360 nm could be detected by the proposed dual-band UV-PDs. When a reverse bias voltage of -5 V was applied on the dual-band UV-PDs, the photoresponsivity at 310 and 360 nm was 196.0 and 0.70 A/W, respectively. The noise equivalent power at 310 and 360 nm was 9.81 x 10(-15) W and 2.78 x 10(-12) W, respectively. Furthermore, the specific detectivity at 310 and 360 nm was 9.67 x 10(13) and 3.41 x 10(11) cmHz(0.5)W(-1), respectively. Published by the AVS.