Electrodeposition of selenium from 1-butyl-1-methylpyrrolidinium trifluoromethylsulfonate
Journal article, 2012

Electrodeposition of Se films from air and water stable 1-butyl-1-methylpyrrolidinium trifluoromethylsulfonate ionic liquid was studied in open air conditions. The electrochemical behavior of H2SeO3 on gold and copper substrates was investigated in ionic liquid-water mixtures, and the influence of the deposition parameters such as time and bath temperature on the crystallinity of the film was examined. For the gold substrate, a reddish deposit containing amorphous, hexagonal and rhombohedral Se phases was identified at room temperature, while a grayish film of hexagonal and rhombohedral phases was formed at higher temperatures. The reddish Se film was found to exhibit a smoother surface with lower reflectivity in comparison to the grayish one. The band gap of the reddish film was close to that of pure amorphous red Se reported in literature, while the band gap of the grayish film was close to the pure hexagonal film. Photoelectron spectroscopy and energy dispersive X-ray spectroscopy show that both films consist of pure Se with only slight surface contaminations by remnants from the electrodeposidon. In the case of a copper substrate, the electrodeposition of Se was accompanied by the formation of copper-selenide due to the reactivity of copper in H2SeO3.

copper

cuinse2

Electrodeposition

Copper-selenide

nucleation

Ionic liquids

Selenium

growth

bath

thin-films

trigonal selenium

se

deposition

amorphous selenium

Author

A. A. Aal

Clausthal University of Technology

Chalmers University of Technology

Central Metallurgical Research and Development Institute, Cairo

F. Voigts

Clausthal University of Technology

Dinko Chakarov

Chalmers, Applied Physics, Chemical Physics

F. Endres

Clausthal University of Technology

Electrochimica Acta

0013-4686 (ISSN)

Vol. 59 228-236

Subject Categories

Other Engineering and Technologies

DOI

10.1016/j.electacta.2011.10.064