Density functional theory based calculations were performed to study the modification of the electronic and structural properties originating from the interaction between the (10,0) GaPNT and the FeCl₃ and CrO₃ compounds, using the software SIESTA. The results show that, for both compounds interacting with the GaPNT, the structures remained practically the same with a small deformation. In all studied systems, FeCl₃ acts as an acceptor of electrons while CrO₃ as an electron donor. The binding energy showed that both the FeCl₃ and CrO₃ compounds interact strongly with the GaPNT through a chemisorption process. Projected density of states analysis shows that the electronic properties were drastically modified with the adsorption of the FeCl₃ compound on the GaPNT due to the appearance of localized states in the gap region. In all systems, the band gap was reduced except in the case of CrO₃ adsorbed outside the GaPNT, in which the band gap was increased. In the case of FeCl₃ adsorbed inside the GaPNT, the system became metallic, while all the other systems remained semiconductors.