Electrodeposition of selenium from 1-butyl-1-methylpyrrolidinium trifluoromethylsulfonate
Artikel i vetenskaplig tidskrift, 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-selenide

se

trigonal selenium

bath

cuinse2

growth

thin-films

amorphous selenium

Ionic liquids

Electrodeposition

copper

Selenium

deposition

nucleation

Författare

A. A. Aal

Technischen Universität Clausthal

Central Metallurgical Research and Development Institute, Cairo

Chalmers

F. Voigts

Technischen Universität Clausthal

Dinko Chakarov

Chalmers, Teknisk fysik, Kemisk fysik

F. Endres

Technischen Universität Clausthal

Electrochimica Acta

0013-4686 (ISSN)

Vol. 59 228-236

Ämneskategorier

Annan teknik

DOI

10.1016/j.electacta.2011.10.064

Mer information

Senast uppdaterat

2018-09-10