  We report for the first time large photoresponse in a single NW of the charge
transfer complex Cu:TCNQ. We fabricate a metal-semiconductor-metal device with
a single NW and focus ion beam deposited Pt. We observe large photocurrent even
at zero bias. The spectral dependence of the photoresponse follows the main
absorption at ~ 405 nm which has the primarily responsible for photogenerated
carriers. We have quantitatively analyzed the bias dependent photocurrent by a
model of two back to back Schottky diodes connected by a series resistance. The
observation shows that the large photoresponse of the device primarily occurs
due to the reduction of the barrier at the contact regions due to illumination
along with the photoconductive contribution. There is also a bias driven
reduction of the nanowire resistance that is a unique feature for the material.
