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These studies are aimed to investigate influences of Ga dopant and As dopant on the optical properties of silicene. Silicene, a silicon analog of graphene, is expected to be better suited than graphene for the electronics industry, which is currently still dominated by silicon. In order to expand its application, its properties must be controllable. The development of the properties can be done by doping or applying external electric fields and stress. Like carbon, silicon also belongs to group IV of the periodic table. Ga (elements from group III) and As (element from group V) can play the role of dopant donor or acceptor in silicene. Therefore, the Density Functional Theory (DFT) calculations were carried out using a general gradient approach in order to investigate the influence of Ga atoms and Al atoms on the optical properties of silicon dioxide. The optical properties studied include refraction, reflection, and absorption. The results show that Ga doping, As doping, and Ga-As codoping reduce the value of the linear optical properties. The ability to control and exploit its optical properties shed light on designing silicene-based electronic and spintronics materials.

The emergence of two dimensional materials was triggered by the discovery of graphene, carbon atoms with honey comb structure. Silicene, the silicon analogue of graphene, is expected to be more compatible with electronic industries, which are currently still dominated by silicon. In order to be more flexible in application, functionalization of silicene is necessary. Ga atoms from group III and As atoms from group V of the periodic table may play the roles of donor and acceptor dopant on silicene which consists of Si atoms from group IV. We have performed density functional theory calculations with a generalized gradient approximation to investigate the effects of a Ga atom and an Al atom on the optical properties of silicene. Optical properties investigated include refraction, reflection, and absorption. Doping of gallium, arsenic, and gallium arsenic decrease the value of the linear optical properties.