Browsing by Author "Haouanoh, D."

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    Influence of Deposition Time on the CdS Thin Films Prepared by a Chemical Bath Deposition (CBD)
    (2020) Haouanoh, D.; Tala-Ighil, Razika; Bensouici, F.; Toubane, Mahdia
    Cadmium sulfide thin layers are frequently used in photovoltaic, especially in the realization of Cu2ZnSnS4 (CZTS) based solar cells as buffer layer. In this work, cadmium sulphide (CdS) thin films have been carried out by using chemical bath deposition (CBD) method. They were deposited onto glass substrates from chemical bath containing cadmium sulfate, thiourea and ammonia at pH = 12. The temperature of the bath was fixed at 60 ºC, and under 150 RPM stirring, the time deposition was varied (10 mn–40 mn). X-ray diffraction revealed the cubic and hexagonal structures formation with secondary phase CdO. AFM images of CdS thin films show that the substrate is covered with granular structures of different size, the root mean square (Rms) value prepared at different time (10 mn, 20 mn, 30 mn and 40 mn) are, 26.05, 25.08, 19.93 and 38.55 nm. High transmission is obtained in the visible and near infra-red.
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    Materials Research Express Paper Effects of thermal treatment and layers' number on SnO2 thin films properties prepared by sol-gel technique
    (Iop science, 2019) Haouanoh, D.; Tala-Ighil, Razika; Toubane, Mahdia
    Tin oxide layers are very important in photovoltaic applications. This paper presents an in-depth study of the SnO2 thin films deposited by the gel dip coating technique on glass substrates. The heat treatment and the number of layers effect on structural, morphological, optical and electrical properties were studied. Differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA) showed that SnO2 crystallized at 402.5 °C. The diffraction spectra x-rays revealed that a formation of tetragonal cassiterite structure with a preferred growth orientation according to (101) plane. Exceptional film prepared at 200 °C preheated temperature is according to the (110) plane growth orientation. The size of the crystallites is strongly influenced by the preheated temperature, annealing temperature and a number of layers. The AFM images show homogeneous surfaces for all samples except the film prepared at a preheated temperature of 200 °C. However, it becomes smoother by increasing the number of layers. UV-Visible spectroscopy has shown that greater transparency is found in the infrared and visible domains (75%–96%). For all films, the optical band gap energy varies randomly with the preheated temperature; conversely, it increases from 3.83 eV to 3.88 eV for three-layer and six-layer films respectively. The energy gap decreases for samples with more than 6 layers. The minimum resistivity values are 8.1 10–1 Ω cm determined by the four probe method for the sample preheated to 400 °C without annealing temperature