Strain-induced ordered Ge(Si) hut wires on patterned Si (001) substrates

Ge/Si nanowires are predicted to be a promising platform for spin and even topological qubits. While for large-scale integration of these devices, nanowires with fully controlled positions and arrangements are a prerequisite. Here, we have reported ordered Ge hut wires by multilayer heteroepitaxy on...

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Bibliographic Details
Published in:Nanoscale 2023-04, Vol.15 (16), p.7311-7317
Main Authors: Ming, Ming, Gao, Fei, Wang, Jian-Huan, Zhang, Jie-Yin, Wang, Ting, Yao, Yuan, Hu, Hao, Zhang, Jian-Jun
Format: Article
Language:English
Subjects:
Germanium
Huts
Multilayers
Nanowires
Nucleation
Qubits (quantum computing)
Self-assembly
Silicon substrates
Tensile strain
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Summary:Ge/Si nanowires are predicted to be a promising platform for spin and even topological qubits. While for large-scale integration of these devices, nanowires with fully controlled positions and arrangements are a prerequisite. Here, we have reported ordered Ge hut wires by multilayer heteroepitaxy on patterned Si (001) substrates. Self-assembled GeSi hut wire arrays are orderly grown inside patterned trenches with post growth surface flatness. Such embedded GeSi wires induce tensile strain on the Si surface, which results in preferential nucleation of Ge nanostructures. Ordered Ge nano-dashes, disconnected wires and continuous wires are obtained correspondingly by tuning the growth conditions. These site-controlled Ge nanowires on a flattened surface lead to the ease of fabrication and large-scale integration of nanowire quantum devices. In this study, we demonstrate uniform Ge hut wire arrays on a flattened surface by multi-layer growth of strained Ge(Si) layers separated with Si spacer layers on top of site-controlled GeSi hut wires.
ISSN:2040-3364
2040-3372
DOI:10.1039/d2nr05238e