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Vapor-solid-solid grown Ge nanowires at integrated circuit compatible temperature by molecular beam epitaxy

Z Zhu ; Y Song ; Z Zhang ; H Sun ; Y Han ; Y Li ; L Zhang ; Z Xue ; Z Di ; Shumin Wang (Institutionen för mikroteknologi och nanovetenskap, Fotonik)
Journal of Applied Physics (0021-8979). Vol. 122 (2017), 9, p. 94304.
[Artikel, refereegranskad vetenskaplig]

We demonstrate Au-assisted vapor-solid-solid (VSS) growth of Ge nanowires (NWs) by molecular beam epitaxy at the substrate temperature of similar to 180 degrees C, which is compatible with the temperature window for Si-based integrated circuit. Low temperature grown Ge NWs hold a smaller size, similar uniformity, and better fit with Au tips in diameter, in contrast to Ge NWs grown at around or above the eutectic temperature of Au-Ge alloy in the vapor-liquid-solid (VLS) growth. Six < 110 > growth orientations were observed on Ge (110) by the VSS growth at similar to 180 degrees C, differing from only one vertical growth direction of Ge NWs by the VLS growth at a high temperature. The evolution of NWs dimension and morphology from the VLS growth to the VSS growth is qualitatively explained by analyzing the mechanism of the two growth modes.



Denna post skapades 2017-10-03. Senast ändrad 2017-10-10.
CPL Pubid: 252218

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Fotonik

Ämnesområden

Nanoteknik

Chalmers infrastruktur