Abstract
The effect of UV light during electrodeposition of germanium on Au and on indium tin oxide (ITO) from the ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide ([Py1,4]Tf2N) has been investigated. From cyclic voltammetric analysis, two reduction peaks were observed and were assigned to the reduction of Ge(IV) to Ge(II) species, and Ge(II) to Ge(0) species. On using 254 nm UV light during electrodeposition, a decrease of 140 mV occurred on the ITO substrate for the reduction of Ge(IV) to Ge(II) compared with that observed without UV, and a decrease of 204 mV was observed in the reduction of Ge(II) to Ge. The shift in the reduction peak seems to be related to the photoabsorption of UV by the electrolyte, possibly altering the ionic liquid/electrode interface. By characterizing the Ge deposit using scanning electron microscopy, it was observed that the presence of UV irradiation significantly decreased the Ge particle size. A green luminescence was also observed from the electrolyte du...
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