<p>Enhancing the quantum efficiency of transparent multilayer solar cells is crucial for advancing the field of renewable energy. The aim of this study is to develop a model for transparent thin-film solar cells with high efficiency. The polyvinyl alcohol doped by NaI was prepared in a laboratory. The PVA’s complex refractive indices were measured to be used in a proposed model for transparent solar cells using MATLAB code. This code calculates quantum efficiency through materials optical properties using the Transfer Matrix Method. A transparent multilayer thin-film silicon solar cell was proposed using Polyvinyl Alcohol (PVA)—A water-soluble synthetic polymer (PVA) 10% NaI as the substrate and protective layer. The external quantum efficiency reached 66.62, with a short-circuit current of 31.66&#xa0;mA/cm².The model shows that using PVA with 10% NaI in an amorphous silicon multilayer thin-film solar cell achieves the highest external quantum efficiency. The researchers concluded that with an increase in doping with NaI salt, the minority charge carriers contributed to the increase in the current with the participation of sodium and iodine ions. However, an increase in the doping by more than 10 percent contributes to the charge carriers of polyvinyl alcohol impurities, reducing the effect of movement; thus, the current decreases again.</p>