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Chin. Phys. B, 2014, Vol. 23(4): 046803    DOI: 10.1088/1674-1056/23/4/046803

Optical and electrical characterizations of nanoparticle Cu2S thin films

M. Saadeldina, H. S. Solimanb, H. A. M. Alib, K. Sawabya
a Physics Department, Faculty of Science, Cairo University, Giza 12613, Egypt;
b Physics Department, Faculty of Education, Ain-Shams University, Cairo 11757, Egypt
Abstract  Copper sulfide thin films are deposited onto different substrates at room temperature using the thermal evaporation technique. X-ray diffraction spectra show that the film has an orthorhombicchalcocite (γ-Cu2S) phase. The atomic force microscopy images indicate that the film exhibits nanoparticles with an average size of nearly 44 nm. Specrtophotometric measurements for the transmittance and reflectance are carried out at normal incidence in a spectral wavelength range of 450 nm-2500 nm. The refractive index, n, as well as the absorption index, k is calculated. Some dispersion parameters are determined. The analyses of ε1 and ε2 reveal several absorption peaks. The analysis of the spectral behavior of the absorption coefficient, α, in the absorption region reveals direct and indirect allowed transitions. The dark electrical resistivity is studied as a function of film thickness and temperature. Tellier's model is adopted for determining the mean free path and bulk resistance.
Keywords:  physical properties of Cu2S thermal evaporation      nanoparticle Cu2S thin films  
Received:  22 June 2013      Revised:  10 September 2013      Accepted manuscript online: 
PACS: (Semiconductors)  
Corresponding Authors:  K.Sawaby     E-mail:
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M. Saadeldin, H. S. Soliman, H. A. M. Ali, K. Sawaby Optical and electrical characterizations of nanoparticle Cu2S thin films 2014 Chin. Phys. B 23 046803

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