Light matter interaction in WS$_{2}$ nanotube-graphene hybrid devices
  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. 
John P. Mathew, Gobinath Jegannathan, Sameer Grover, Pratiksha D.   Dongare, Rudheer D. Bapat, Bhagyashree A. Chalke, S. C. ...
cond-mat.mes-hall