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) Energy band diagram and concept of the defective graphene. PE: photo excited; II: impact ionizition; AR: Auger recombination; Trap: free electrons trapped in midgap state band.