Abstract
The growth of CZTS thin films by electrodeposition has numerous advantages in terms of controlling the deposition parameters. However, the electrochemical cells in conventional potentiostat are small and require precise adjustment. Electrodeposition is feasible by controlling solely the current without using a reference electrode and hence an expensive potentiostat. The cost and surface area limitations can be overcome by utilizing the simple two-electrodes cell and a current source. Therefore, in this study, CZTS thin films were amperometrically deposited on various substrates using our novel two-electrode electrochemical cell setup. The structural, morphological, compositional, optoelectronic properties of the electrodeposited CZTS thin films have been precisely investigated by adjusting the deposition current. Stoichiometry measurements reveal that the chemical composition and hence crystallinity of thin films strongly depend on the applied current. The critical deposition current for Zn-rich films was found to be between 0.97 and 0.98 mA/cm2.
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