Journal
ELECTROCHIMICA ACTA
Volume 53, Issue 10, Pages 3650-3655Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2007.12.027
Keywords
anodic electrode reaction; porous silicon; room-temperature ionic liquid (RTIL); EtMeIm(FH)(2.3)F; photoluminescence
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The anodic electrode behavior for a p-type silicon single crystal electrode ((10 0), p = 0.01-0.02 Q cm, boron doped) was examined in the 1-ethyl-3-methyl imidazolium fluorohydrogenate, EtMeIm(FH)(2.3)F, room-temperature ionic liquid (RTIL). The electrochemical behavior was very similar to that in conventional HF aqueous solution. After the anodic electrode reaction, the Si electrode was uniformly covered with a mesoporous Si layer having a pore size of similar to 25 nm. The mesoporous layer did not exhibit a photoluminescence spectrum in the visible region due to the lack of Si-H termination. However, after chemical treatment with an ethanolic HF solution, a subset of the porous Si samples showed a very weak photoluminescence. (c) 2007 Elsevier Ltd. All rights reserved.
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