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Current issue   Ukr. J. Phys. 2017, Vol. 62, N 3, p.208-213
https://doi.org/10.15407/ujpe62.03.0208    Paper

Hladkovskiy V.V., Fedorovich O.A.

Institute for Nuclear Research, Nat. Acad. of Sci. of Ukraine
(47, Nauky Ave., Kyiv 03028, Ukraine; e-mail: v.glad2010@yandex.ua)

Spectroscopic Studies of RF Discharge Plasma at Plasma-Chemical Etching of Gallium Nitride Epitaxial Structures

Section: Plasmas and Gases
Original Author's Text: Ukrainian

Abstract:  The results of experimental researched dealing with the bias voltage influence on the evolution of spectra emitted by plasma at the etching of gallium nitride in a plasma-chemical reactor with the controlled magnetic field are reported. At high bias voltage values above –250 V, there appear lines in the plasma emission spectra which belong to the excited atoms of the material of a working electrode. Under the influence of a negative potential, the active electrode is sputtered, and metal ions are redeposited onto its surface, which results in the lower etching rate.

Key words: bias voltage, plasma-chemical etching, sputtering, plasma-chemical reactor, radio-frequency discharge, optical spectroscopy.