CdSe/ZnO composite coatings have been produced on glass substrates by sintering at 350 to 500°C screen printed layers of CdSe powder, flux (0.1 to 0.5 of flux to powder ratio) and propylene glycol. Depending on the composition of the paste and sintering conditions, photocurrent to dark current ratios of to are observed in the composite film under an intensity of illumination of ∼2000 W m −2 . X-ray diffraction and X-ray fluorescence studies showed that the formation of the CdSe/ZnO composite takes place at temperatures of 350°C and above involving loss of nearly 75% of the chlorine at 350°C and a near total loss at 500°C forming a ZnO layer covering the CdS pigments. Loss of Zn through evaporation of and loss of Cd and Se through evaporation of and Se formed in the sintering process are postulated and evidenced in X-ray fluorescence. The CdSe and ZnO components forming the highly photoconductive composite coating are of hexagonal phase with average grain size of 20-25 nm.
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Gómez-Daza et al. (2001) studied this question.
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