Investigation on the stoichiometric deviations of electrodeposited nano-CdTe compound by a novel numerical simulation

A kinetic model for linear-sweep voltammetry has been developed and modified. The simulation of CdTe electrodeposition has been performed in the acidic electrolyte containing reducible ions of Cd²⁺ and HTeO₂⁺, and the potential can be predicted to get good quality photosensitive material. A numerical simulation for the stoichiometric determination of electrodepo-sited CdTe thin film is presented for the first time, and the stoi-chiometric deviation can be controlled accurately. Well-connected granular CdTe thin films have been deposited at PPS, but are slightly p-type due to cadmium vacancies (V_Cd). In order to determine the stoichiometry of samples with a small deviation, it is necessary to decrease the concentration of HTeO₂⁺. The stoi-chiometry deviations fall in the 50.001% range can be estimated. The control of stoichiometric deviation in Cd-rich is much better than in Te-rich by electrodeposited potential.