Publication: Photo-induced cubic-to-hexagonal polytype transition in silicon nanowires
Дата
2019
Авторы
Rodichkina, S. P.
Belarouci, A.
Bezverkhyy, I.
Chassagnon, R.
Lysenko, V.
Timoshenko, V. Y.
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Аннотация
© 2019 The Royal Society of Chemistry.Transformation of the crystalline lattice in silicon nanowires from cubic diamond (cub-Si) to hexagonal diamond (hex-Si) was observed under laser irradiation at intensities above 10 kW cm-2 (wavelength of 473 nm) by appearance of an additional peak in their Raman spectra in the range from 490 to 505 cm-1. Formation of the hex-Si phase in SiNWs is favoured by strong mechanical stresses caused by inhomogeneous photo-induced heating, which results in a singlet-doublet splitting of the Raman peaks for LO and TO phonons at about 517 and 510 cm-1, respectively. The estimated values of the photo-induced mechanical stresses and temperatures required for the polytype transformation in SiNWs correspond to those for bulk Si. The formation of the hex-Si phase in SiNWs is further illustrated by huge photoluminescence (PL) enhancement at laser intensities above 10 kW cm-2, which correlates with the appearance of the Raman peak at about 500 cm-1. The spectral position of the PL band at about 1.5 eV is close to the direct band gap transition in the stressed hex-Si.
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Photo-induced cubic-to-hexagonal polytype transition in silicon nanowires / Rodichkina, S.P. [et al.] // CrystEngComm. - 2019. - 21. - № 32. - P. 4747-4752. - 10.1039/c9ce00562e
URI
https://www.doi.org/10.1039/c9ce00562e
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https://www.scopus.com/record/display.uri?eid=2-s2.0-85070654899&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000480618300008
https://openrepository.mephi.ru/handle/123456789/18561