Electrolyte electroabsorbance

Recently, a eutectic mixture of choline chloride and urea (commercially known as Reline) was used as a medium from which CdS, as well as CdSe and ZnS, thin films were electrodeposited for the first time [53]. Reline is a conductive room-temperature ionic liquid (RTIL) with a wide electrochemical window. The voltammetric behavior of the Reline-Cd(II)-sulfur system was investigated, while CdS thin films were deposited at constant potential and characterized by photocurrent and electrolyte electroabsorbance spectroscopies. 

The technique of EER (or electrolyte electroabsorbance (EEA) in the case of thin films) is a powerful way of determining bandgaps and also of assessing compositional and structural defects. The method is based on perturbing the optical properties of a semiconductor by applicahon of an electric field [151,152]. The method involves applying an AC modulahon to the applied potential when the sample is the working electrode held in depletion conditions in an electrochemical ceU to... 

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