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Vol. 27, Special Issue, May 2014, pp. 319-325

 

Bullet

 

Characterization of Silver Sulphide Thin Films Prepared by Spray Pyrolysis Using
a New Precursor Silver Chloride
 

1 Kamel SAHRAOUI, 1 Noureddine BENRAMDANE, 1 Mohamed KHADRAOUI, 1 Redouane MILOUA, 2 Christian MATHIEU

1 Laboratoire d’Elaboration et de Caractérisation des Matériaux, Djillali Liabes University of Sidi Bel-Abbes, Algeria
2 Centre de calcul et de modélisation de Lens, Université d'Artois, Faculté Jean Perrin, Rue Jean Souvraz, Sp.18, 62307 Lens Cedex France
1 Tel.: 00213551554040

E-mail: sahraouikamel68@yahoo.fr

 

Received: 23 November 2013 /Accepted: 12 January 2014 /Published: 26 May 2014

Digital Sensors and Sensor Sysstems

 

Abstract: Silver sulphide is a semiconductor widely used as an infrared sensor and as an absorber material for solar cells. In this work, we report the preparation of Ag2S thin films from a new precursor using chemical spray pyrolysis technique. The thin films having various [CS(NH2)2]/[AgCl] were grown at different substrate temperatures and characterized using X-Ray diffraction, Scanning Electron Microscopy, transmission T(λ) and reflectivity R(λ) measurements. The diffraction patterns showed that the sample having x =[CS(NH2)2]/[AgCl]=5 ratio at the substrate temperature Ts =200 °C has the best crystallinity and exhibits a monoclinic structure preferentially oriented in the direction of (- 112) lattice plan . The optical properties have been investigated using spectrophotometric measurements in the wavelength range 200-2500 nm. The obtained values of the band gap energy were in the order of 1 eV. The refractive index n and the extinction coefficient k were determined from the absolute values of the measured transmittance and reflectance. The conductivity at room temperature was 32´10 –3(W cm)-1, and the films were n type.

 

Keywords: Silver sulphide, Silver chloride, Ag2S thin films, Acanthite, Sprays pyrolysis.

 

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