Theoretical Evaluation of Specific Heat Capacity and Its Application of Some Solar Cell Materials

A simple and efficient analytical formula for the Debye function has been derived based on the binomial expression and gamma function in this study. Different analytic formulae for Debye function are given, and the convergence of the corresponding series is discussed for a wide range of the parameters. In this study, the analytic formula presented for the Debye function can be applied to evaluate some of the thermodynamic properties of solid. It has been demonstrated that this formula gives very accurate results for the specific heat capacity of solar cells over a wide range of temperatures. The results for specific heat capacity of solar cell Si, CuInSe2 and CdTe materials have been compared with theoretical calculations and experimental data and indicated that the analytical formula can be satisfactorily used for other solids.