▎ 摘　　要

In this work, a simple low-cost technique is presented to fabricate reduced graphene oxide (rGO)-based near infrared photodetectors using vitamin C (ascorbic acid) as a reduction agent. Different levels of reduction can be obtained by varying the number of reduction cycles. The current-voltage characteristics of the fabricated rGO show excellent sensitivity towards the illumination of a continuous-wave laser. It is shown that the electrical conductivity of the devices is tailored based on the reduction level, resulting in highly enhanced conductivity. The large enhancement factors are measured for the values of photoresponsivity of the rGO at a higher reduction level.