Thermal Expansion Of Environmentally Friendly Semiconductor Materials
Abstract
Multicomponent anisotropic semiconductors I-III-VI2 have ample opportunities for practical application in optoelectronics. The ternary compound CuInSe2 is used as an absorbing layer in high-efficiency solar cells. With a band gap Eg ≈ 1.05 eV, it is characterized by an exceptionally high absorption coefficient (α_L ≥ 105 cm–1). The basis for many photoconverters are heterojunctions created between CdS and CuInSe2, but the metal–CuInSe2 structure can also be a simple and cheap alternative. One of the main problems that arise when compounds I-III-VI2 are used in heterostructures is the negative coefficient of thermal expansion (TEC) αL at low temperatures. The article describes a physical model of thermal expansion of semiconductors I-III-VI2, which can calculate both negative and positive CTE and is in good agreement with the actual values and temperature behavior of the CTE of these materials. The model takes into account the temperature dependences of the band gap E_(G ) (T)and the vibrational spectrum of the lattice. All calculations were carried out for the CuInSe2 compound based on the Mathcad 11 and Maple 9 computer mathematics systems. From a physical point of view, the observed negative CTE is explained by the contribution of the optical vibrational mode 〖 G〗_5^6 (T),, and the knowledge of the Grüneisen parameter makes it possible to calculate this negative CTE.
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European Publisher
Volume
135
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-
Edition Number
1st Edition
Pages
1-1
Subjects
Sociolinguistics, linguistics, semantics, discourse analysis, translation, interpretation
Cite this article as:
Matiyev, A. K., Uspazhiev, R. T., & Khasanov, A. I. (2024). Thermal Expansion Of Environmentally Friendly Semiconductor Materials. In D. K. Bataev (Ed.), PROOF: Social and Cultural Transformations in the Context of Modern Globalism (SCTCMG 2023), vol 135. European Proceedings of Social and Behavioural Sciences (pp. 267-274). European Publisher. https://doi.org/10.15405/epsbs.2024.10.34