Energy band gaps and optical absorption properties of the CdZnS and CdZnS:PEO thin films prepared by chemical bath deposition

The optical characteristics of (CdZnS) and (CdZnS:PEO) nanofilms made by the chemical bath deposition technique were examined in the current paper. The films displayed an typical transmission of 65-90% ranging between 500-900 nm. Transmission touched the 90% for wavelength of 600 nm and above. The bandgap energy of CdZnS film was 3eV and was found to be increased to 3.1 eV after using poly ethylen oxide (PEO). All of these results show that PEO can make CdZnS film better. The better transmission of the prepared films also shows that the method described is good for making CdZnS thin films for solar cells.