Improvement of sensitivity of graphene photodetector by creating bandgap structure

Zhang Ni-Zhen¹, He Meng-Ke¹, Yu Peng^{1, †}, Zhou Da-Hua^{2, ‡}

(color online) Time-dependent photocurrent measurement of (a) the pristine graphene photodetector and (b) the defective graphene photodetector under the irradiation of 635 nm laser.