In this paper, the design area of a fabricated solar cell has been analyzed with respect to its charge density. The mathematical calculation used for charge-density derivation was obtained from the 2001 version of a MATHCAD program. The parameter range for the calculations was ±1×1017 cm-3, which is in the normal parameter range for n-type doping impurities (7.0×1017 cm-3) and also for p-type impurities (4.0×1017 cm-3). Therefore, it can be said that the fabricated solar-cell design area has a direct effect on charge-density changes.