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Strong dependence of photocurrent on illumination-light colors for ZnO/graphene Schottky diode
이화욱,안남현,정석진,강순홍,권순기,이지수,이영민,김득영,이세준 한국물리학회 2017 Current Applied Physics Vol.17 No.4
The ZnO/graphene Schottky diode reveals a strong dependence of its photocurrent on the color of the illuminating lights (i.e., a dependence of photocurrent on the photon energy). As the photon energy increases, the magnitude of photocurrent is exponentially increased. Particularly, in comparison with the red-light illumination, the device clearly exhibits approximately 100-times-increased photocurrent when illuminating the ultra-violet light. We attribute this feature to the increase in photo-excited carriers at the depletion region in ZnO. The results suggest that the ZnO/graphene Schottky diode holds promise for the application in high-performance color-selectable photodetectors.