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Thin films of zinc cadmium sulphide – a ternary compound intended to be used in solar cells – are prepared by co-evaporation. The films are prepared at room temperature, in a vacuum better than 10 –5  Torr. The composition of these films is varied from  x  = 0 to  x  = 1 in the compound Zn  x  Cd 1– x  S. The structural, optical and electrical properties have been investigated as a function of x. The direct band gap varies from 2.415 eV to 3.41 eV for  x  = 0 to  x  = 1 respectively. The crystal structure is found to be hexagonal (Wurtzite) for 0 ≤  x  ≤ 0.8 and cubic zinc-blende for  x  &gt; 0.8. The lattice constants decrease and the optical bandgap increases with the increase in the value of x. The resistivity of the Zn  x  Cd 1– x  S films is found to decrease from 3.6 × 10 4  Ω cm for  x  = 0 to 69.5 Ω cm for  x  = 0.3 and again increases beyond this range to a value of 6.3 × 10 3  Ω cm for  x  = 1.0.

international journal of materials research

Dependence of optical, structural and electrical properties of Zn  x  Cd 1– x  S thin films prepared by co-evaporation on the composition for  x  = 0 – 1