Photocurrent Distribution in Graphene–CdS Nanowire Devices

The spatial distribution of photocurrents generated in nanoscale devices comprising a contact between a graphene sheet and a cadmium sulfide nanowire is explored. The magnitude and spatial extent of the photocurrent can be improved through appropriate chemical modification of the graphene–CdS interface. Moreover, the photocurrent maps provide direct evidence for the generation of electron–hole pairs by surface plasmon near fields.