  We study the light matter interaction in WS$_{2}$ nanotube-graphene hybrid
devices. Using scanning photocurrent microscopy we find that by engineering
graphene electrodes for WS$_{2}$ nanotubes we can improve the collection of
photogenerated carriers. We observe inhomogeneous spatial photocurrent response
with an external quantum efficiency of $\sim 1\%$ at 0 V bias. We show that
defects play an important role and can be utilized to enhance and tune
photocarrier generation.

Mesoscale and Nanoscale Physics