The increasing of annealing temperature leads to decreases in the values of energy gap.
1. the annealing process conformed the crystallinty of the films .
2. the increase of the annealing temperature may be increase the partical size or the crystallite ( grain ) size .
3. So the energy band gap decreases by the quantum confinement phenomena.
CdS by Sol. Gel. Spin Coating technique.
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CdO , SnO2 , ZnO TCO
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