| Texto completo | |
| Autor(es): |
Oliveira, D. S.
[1]
;
Tizei, L. H. G.
[2]
;
Li, A.
[3]
;
Vasconcelos, T. L.
[4]
;
Senna, C. A.
[4]
;
Archanjo, B. S.
[4]
;
Ugarte, D.
[1]
;
Cotta, M. A.
[1]
Número total de Autores: 8
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas, UNICAMP, Inst Fis GlebWataghin, BR-13083859 Campinas, SP - Brazil
[2] Univ Paris 11, CNRS UMR 8502, Lab Phys Solides, F-91405 Orsay - France
[3] TU Eindhoven, Dept Appl Phys, NL-5612 AZ Eindhoven - Netherlands
[4] Inst Nacl Metrol Qualidade & Tecnol INMETRO, Div Met Mat, BR-25250020 Duque De Caxias, RJ - Brazil
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | NANOSCALE; v. 7, n. 29, p. 12722-12727, 2015. |
| Citações Web of Science: | 9 |
| Resumo | |
Semiconductor nanowires oriented along the {[}211] direction usually present twins parallel to their axis. For group IV nanowires this kind of twin allows the formation of a catalyst-nanowire interface composed of two equivalent [111] facets. For III-V nanowires, however, the twin will generate two facets with different polarities. In order to keep the < 211 > orientation stable, a balance in growth rates for these different facets must be reached. We report here the observation of stable, micron-long < 211 >-oriented InGaP nanowires with a spontaneous core-shell structure. We show that stacking fault formation in the crystal region corresponding to the [111] A facet termination provides a stable NW/NP interface for growth along the < 211 > direction. During sample cool down, however, the catalyst migrates to a lateral [111] B facet, allowing the growth of branches perpendicular to the initial orientation. In addition to that, we show that the core-shell structure is non-concentric, most likely due to the asymmetry between the facets formed in the NW sidewall; this effect generates stress along the nanowire, which can be relieved through bending. (AU) | |
| Processo FAPESP: | 13/02300-1 - Nanofios semicondutores: mecanismos de formação e aplicação em biossensores |
| Beneficiário: | Mônica Alonso Cotta |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |