A fundamental study on the electronic and optical properties of graphene oxide under an external electric field

In this work, we study the impact of the external electric field [Formula: see text] on graphene oxide (GO) layer to improve and optimize its electronic and optical properties, as a result to enhance optoelectronic device technology applications. A three-dimensional [Formula: see text] applied on GO will be examined using the density functional theory (DFT). The [Formula: see text] causes significant modifications to the electronic and optical properties of GO. When increasing the [Formula: see text], a global increase is noted in the bandgap in the x- and y-directions. As for the z-direction, the bandgap energy of GO decreases for an increasing [Formula: see text]. The absorption coefficient ([Formula: see text]) peaks intensities decreased in both visible and ultraviolet (UV) ranges by the effect of the [Formula: see text] applied in the x-direction, and were increased when the [Formula: see text] is applied in the y- and z-directions. It was found that, the electronic and optical properties of GO material, could be controlled by the effects of the [Formula: see text] and by its direction.