Low-temperature spray-pyrolysis of FeS2 films and their electrical and optical properties
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Iron disulfide (FeS2) films with a wide range of electrical resistivities 100 Ω cm ⩽ ρ ⩽ 800 kΩ cm, a high adhesion to the substrate, and a resistance to aggressive media have been prepared by the spray pyrolysis of aqueous solutions of the salts FeCl3 · 6H2O and (NH2)2CS at low temperatures in the range 250°C ⩽ T S ⩽ 400°C. It has been found that the FeS2 films have a high transmittance T ≈ 60–70% and are characterized by a sharp transmission edge. It has been shown that the optical band gap for direct (E g op = 2.19–2.78 eV) and indirect (E g ′op = 1.26–1.36 eV) optical transitions depends on the conditions of film preparation.
KeywordsPyrolysis Electrical Resistivity Spray Pyrolysis Pyrolysis Temperature High Sulfur Concentration
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