Abstract
CdS thin films were grown on flexible PET and PET/ITO substrates by chemical bath deposition varying the deposition time. The structural analysis indicates that CdS films are composed of nano-crystalline and amorphous material. CdS films grown on PET substrates have hexagonal phase, while those grown on PET/ITO substrates have a cubic phase. The bandgap values of CdS films grown on PET substrates are in the range 2.31–2.45 eV, and the Eg of CdS films grown on PET/ITO substrates are 2.18–2.42 eV. A strong green photoluminescence emission was observed in all the samples, which is associated to near band edge transitions. CdS films grown on PET/ITO substrates have an additional emission at 2.80 eV, which can be attributed to the presence of nano-crystals, in agreement with TEM analyses.
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