Screen printed CdS films has been studied with various techniques. Although the thick films preserved the feature of powder crystals, i.e., lack of orientation, it is found that more amounts of (112) wurtzite phase might be good for the electrical property of CdS films. The flux CdCl2, which was added to the CdS films, resulted in two trapping levels, 0.4 ev and 0.68 ev. The mechanism and the effect of flux on the CdS films are discussed. Besides, the effect of vacuum annealing is also described.
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