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Current issue   Ukr. J. Phys. 2016, Vol. 61, N 11, p.980-986
http://dx.doi.org/10.15407/ujpe61.11.0980    Paper

Voitovych V.V.1, Rudenko R.M.1, Yuchymchuk V.O.2, Voitovych M.V.2, Krasko M.M.1, Kolosiuk A.G.1, Povarchuk V.Yu.1, Khachevich I.M.2, Rudenko M.P. 3

1 Institute of Physics, Nat. Acad. of Sci. of Ukraine
(46, Nauky Prosp., Kyiv 03680, Ukraine; e-mail: vvoitovych@yahoo.com)
2 V.E. Lashkaryov Institute of Semiconductor Physics, Nat. Acad. of Sci. of Ukraine
(45, Nauky Prosp., Kyiv 03028, Ukraine)
3 Mykola Gogol State University of Nizhyn
(2, Krapyv’yanska Str., Nizhyn 16600, Ukraine)

Effect of Tin on Structural Transformations in the Thin-Film Silicon Suboxide Matrix

Section: Solid Matter
Original Author's Text:  Ukrainian

Abstract: The processes of crystallization of amorphous silicon (a-Si) in the a-SiOxSn (1 ≤x≤ 2) suboxide matrix have been studied. The temperature, at which the crystallization begins, is shown to be lower for a-SiOxSn films with higher tin contents. For specimens with the maximum tin content (about 2 vol.%), the crystallization begins at a temperature of 500 °C; for specimens with the average tin content (about 1 vol.%), the crystallization temperature equals 800 °C; and for specimens with the minimum tin content (about 0.5 vol.%), the crystallization of a-Si starts at 1000 °C. On the other hand, it is shown that tin does not influence the separation of a-Si and the SiO2 phase in the examined specimens. It is found theoretically that silicon crystallites that are formed during the crystallization of a-Si are much smaller (d ≈ 5÷7 nm) in a-SiOxSn films with a high tin content (1 and 2 vol.%) in comparison with the tin-free specimens (d ≥ 10 nm). A metal-induced mechanism of crystallization of a-Si has been proposed, which predicts the existence of tin metal clusters in SiOx that create conditions for the easier transition of the amorphous silicon phase into the crystalline one. On the basis of experimental data, it is supposed that, in our case, a necessary condition for the crystallization of a-Si by the proposed metal-induced mechanism to start is the presence of metal (tin) aggregates in SiOx.

Key words: crystallization, amorphous silicon, tin, nano-sized silicon crystallites.