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Erin: I'll put her on tadacip acquisto on line So far, the biggest drawback of graphene-based photodetectors has been their low responsivity. Â A sheet of graphene â consisting of one layer of carbon atoms - would convert only about 2 per cent of the light passing through it into an electrical current. Thatâs actually quite high for a material only an atom thick, but itâs still too low to be useful.