Thermal Stability and Surface Passivation of Ge Nanowires Coated by Epitaxial SiGe Shells
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- 作者：Shu Hu ; Yoko Kawamura ; Kevin C. Y. Huang ; Yanying Li ; Ann F. Marshall ; Kohei M. Itoh ; Mark L. Brongersma ; Paul C. McIntyre
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：March 14, 2012
- 年：2012
- 卷：12
- 期：3
- 页码：1385-1391
- 全文大小：394K
- 年卷期：v.12,no.3(March 14, 2012)
- ISSN：1530-6992
文摘
Epitaxial growth of a highly strained, coherent SiGe alloy shell around a Ge nanowire core is investigated as a method to achieve surface passivation and carrier confinement, important in realizing nanowire devices. The high photoluminescence intensity observed from the core鈥搒hell nanowires with spectral features similar to that of bulk Ge indicates effective surface passivation. Thermal stability of these core鈥搒hell heterostructures has been systematically investigated, with a method demonstrated to avoid misfit strain relaxation during postgrowth annealing.