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 ${pm}1{ imes}10^{17}cm^{-3}$, which is in the normal parameter range for n-type doping impurities ($7.0{ imes}10^{17}cm^{-3}$) and also for p-type impurities ($4.0{ imes}10^{17}cm^{-3}$). Therefore, it can be said that the fabricated solar-cell design area has a direct effect on charge-density changes.