Direct laser writing of polyimide for flexible graphene photodetectors

Herein, we report a one-step laser writing method to form porous graphene on polyimide (PI), which is capable of broadband-spectral detection. By controlling different parameters of laser processed patterns, various samples were obtained. The comparative photoresponsivity and photocurrent curves of each porous graphene sample were obtained by conducting photoelectric testing at wavelength of 625 nm. The highest photoresponsivity obtained is 5.6´10^-4 A/W, and the corresponding response and recovery times are 27 and 30 s. The method provides a new route to the fabrication of graphene photodetectors and promotes the development of future applications of optoelectronic devices in wearable and flexible electronics.