Bitlis Eren Üniversitesi Fen Bilimleri Dergisi 2147-3129 2147-3188 Bitlis Eren University 10.17798/bitlisfen.1736471 Soft Condensed Matter Yumuşak Yoğun Madde Theoretical Evaluation of Specific Heat Capacity and Its Application of Some Solar Cell Materials https://orcid.org/0000-0001-7126-5194 Somuncu Elif USAK UNIVERSITY https://orcid.org/0000-0002-3185-0951 Bulut Ahmet GIRESUN UNIVERSITY 03 24 2026 15 1 37 47 07 07 2025 01 20 2026 Copyright © 2012, Bitlis Eren Üniversitesi Fen Bilimleri Dergisi 2012 Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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.

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