Wave-vector direction-sensitive photocurrent in laser-induced graphene

Abstract

Porous graphene film structures were formed in the process of line-by-line scanning by a focused laser beam of cw CO2 laser on polyimide film. It was shown that at a power density of 8 W/cm2 and a scanning speed range of 200-260 mm/s, porous graphene is formed on the surface of a 120-μm-thick polyimide film. The results of the investigation of the longitudinal photocurrent generation in LIG film are presented. Photocurrent excitation was carried out by nanosecond laser pulses at wavelength range of 266-1064 nm. It was found that the photocurrent depends on the direction of the wave-vector of the incident radiation according to the odd law characteristic of the photon drag effect (PDE). It is also shown that the presented method of the LIG film formation leads to anisotropy of its photovoltaic properties.