In this study, we have designed and manufactured a simple and relatively inexpensive solar cell, from the available materials in the local markets, where the cell is contained of the outer body (Case), which is a plastic box on a parallel form of rectangles of acrylic transparent allows the passage of light. It has resilient and high durability, and two poles of red copper higher purity, one of them has been thermally treatment to different temperatures (200, 300, 400°C), which turns the copper pole from carrier to semiconductor (cuprous oxide, Cu2O), using heating device (Hot plate). The other pole left without treatment and the electrolyte solution (Gel) has been developed on the (Hydrogel), thus freeing electrons from the treatment plate to the Hydrogel layer then to the clean plate (non-treatment), during shining light. The results showed that the cell voltage proportional to the polyelectrolyte concentration and the area of copper pole (cuprous oxide). As the experiments showed that the temperature has an important role in transforming the metal carrier to the semiconductor, and whenever this conversion possible whenever the pole of the light sensitively more effective and efficient.