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A good choice of the ruthenium doping percentage has given high-quality Fe0.986Ru0.014S2 thin films having desired properties for several applications, such as photovoltaic. These layers have been grown by a simple and non toxic technique: spray pyrolysis. In a first step, for an adequate molar ratio of (FeCl3.6H2O : RuCl3.3H2O), amorphous Ru-doped iron oxide thin films were deposited on glass substrate pre-heated at 350°C. Then, a heat treatment at 450°C under sulfur atmosphere (~10-4 torr) in sealed-tube transformed the as obtained films into Fe0.986Ru0.014S2 films. XRD analysis confirmed the FeS2 phase. The estimated compositions were tested by the EDX analysis. Surface morphology is studied by SEM and AFM and the obtained images showed an inhomogeneous granular structure and a rough surface. However, the granular size varies from 150 nm to 300 nm. The optical measurements showed a high absorption coefficient ( > 3.5x10 cm for wave lengths lower than 800 nm). A direct band gad corresponding to a photon energy of 1.55 eV was obtained after plotting (h) versus the photon energy (h); which is an estimated value for photovoltaic application. The electron mobility in Fe0.986Ru0.014S2 films has been obtained from Hall Effect measurement where an initial current of 1A and a magnetic field, B = 0.554T, are applied. Our layers show n-type conduction. Electrical measurements (bulk concentration =1.0209x10 cm, Sheet Concentration=2.766510 cm) encourage their use as good low cost materials for solar cells. Indeed, the carrier mobility was measured of about 0.21215 cm/(V.s), the resistivity was of 2.8821 Ω.cm, and the conductivity was of 0.34696 Ω1.cm-1. The bulk concentration was of 1.0209×10cm.

Fe0.986Ru0.014S2 Thin Films, Having Desired Properties for Photovoltaic Application, Synthesized by Spray Pyrolysis Technique