Mechanochemically synthesized ternary chalcogenide CuInSe2/TiO2 nanocomposite for solar cell applications

Dutková, Erika and Baláž, Matej and Kováč, Jaroslav and Kashimbetova, Adelia and Briančin, Jaroslav and Kováč Jr., Jaroslav and Čelko, Ladislav (2025) Mechanochemically synthesized ternary chalcogenide CuInSe2/TiO2 nanocomposite for solar cell applications. GEOSCIENCES AND ENGINEERING: A PUBLICATION OF THE UNIVERSITY OF MISKOLC, 13 (1). pp. 45-58. ISSN 2063-6997

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Abstract

In this paper, the simple mechanochemical synthesis of CuInSe2/TiO2 nanocomposite is described. CuInSe2/TiO2 nanocomposite was characterized from the crystal structure, microstructural, morphology, surface, optical, and optoelectrical properties viewpoints. X-ray diffraction has confirmed the nanocrystalline character of all components of the nanocomposite, the crystallite size for CuInSe2 (18 nm) being larger than in the case of both TiO2 phases (5 and 8 nm for rutile and anatase, respectively). Raman spectroscopy confirmed the presence of both components in the synthesized nanocomposite. SEM has shown that the nanoparticles are agglomerated into larger grains. High-resolution XPS analysis confirmed the presence of all elements with their expected oxidation states. The measured optical properties using UV-Vis spectroscopy exhibit stronger absorption from the ultraviolet to visible region with the determined optical bandgap 1.3 eV for mechanochemically synthesized CuInSe2/TiO2 nanocomposite. The photocurrent increased by 57% in CuInSe2/TiO2 nanocomposite compared to CuInSe2 under illumination in comparison with that in the dark state.

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