Semiconductor Physics, Quantum Electronics & Optoelectronics, 22 (2), P. 156-164 (2019).
DOI: https://doi.org/10.15407/spqeo22.02.156
Account of surface contribution to thermodynamic properties
of lead selenide films
1Vasyl Stefanyk Precarpathian National University,
57, Shevchenko Str., 76018 Ivano-Frankivsk, Ukraine,
E-mail: liubomyr.nykyrui@pu.if.ua, bvolochanska@i.ua
Abstract. Being based on the density functional theory (DFT), computer simulation of the surface effect on thermodynamic parameters of lead selenide (PbSe) has been performed in this work. Applying the thermodynamic approach, the choice of model for the plane PbSe [200] preferred orientations has been justified, which indicates domination of the energy of surface states, while minimization of interface energy and deformation are less important in overall changing the free energy. The thermodynamic parameters for the surface of crystals and their temperature dependences in the framework of DFT method and using the hybrid functional B3LYP have been calculated, namely: energy ΔE, enthalpy ΔH, Gibbs’ free energy ΔG, isobaric heat capacities CP and isovolume heat capacities CV, entropy ΔS. The analytical expressions of temperature dependences for these thermodynamic parameters approximated using quantum-chemical calculation data have been obtained. The analysis of temperature dependences for the heat capacity corresponds to the experimental data and the Djulong–Pti law.
Keywords: DFT, IV-VI semiconductors, cluster models, quantum-chemical calculations, thermodynamic properties.
L.I. Nykyruy1, B.P. Naidych1, O.M. Voznyak1, T.O. Parashchuk2, R.V. Ilnytskyi1
2The Institute of Advanced Manufacturing Technology,
Wrocławska 37, Krakow 30-011, Poland
E-mail: taras.parashchuk@ios.krakow.pl
This work is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.