Silicene is a material with a configuration made of Si atoms, hexagonal honeycomb, but not planar. Silicenen nanoribbons are built from silicene structures and modified edges by hydrogen atoms. This work investigates the doping of two Ga atoms into the unit cell of silicene nanoribbons, the system is placed in an external electric field of the order of 0.35V/Å. There are three configurations studied here: meta-configuration, ortho-configuration, and para-configuration. By Using density functional theory (DFT) to calculate the formation energy, state density, and energy band structure of the system. The presence of an external electric field affects the electronic properties of the system, changing the band gap and the density of states. This research contributes in part to the development of materials science.

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