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The Effect of Different Complexing Agents on the Properties of Zinc Sulfide Thin Films Deposited from Aqueous Solutions

Pavlo Shapoval 1, Martyn Sozanskyi 1, Iosyp Yatchyshyn1, Bogdan Kulyk2, Mykhaylo Shpotyuk3 and Roman Gladyshevskii4
1Department of Analytical Chemistry, Lviv Polytechnic National University, 12 S. Bandera St., 79013 Lviv, Ukraine; 2 Scientific-Technical and Educational Center of Low Temperature Studies, Ivan Franko National University of Lviv, 50 Dragomanova St., 79005 Lviv, Ukraine 3Department of Semiconductor Electronics, Lviv Polytechnic National University, 12 S. Bandera St., 79013 Lviv, Ukraine 4Department of Inorganic Chemistry, Ivan Franko National University of Lviv, 6 Kyryla i Mefodiya St., 79005 Lviv, Ukraine
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The zinc sulfide (ZnS) thin films were prepared on glass substrates by chemical bath deposition using the aqueous solutions of zinc chloride, thiourea, pH regulator and complexing agent (ammonia and hydrazine hydrate, trisodium citrate or sodium hydroxide). The calculations of boundary conditions for formation of zinc sulfide and zinc hydroxide were made at various zinc salt concentrations with different complexing agents. The structural, morphology and optical properties of the ZnS thin films were investigated. The thickness of ZnS films was measured and the recalculation of zinc mass per cm2 of the substrate surface was held for comparison. The deposition mechanism is discussed.

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