InP Nanoflag Growth from a Nanowire Template by in Situ Catalyst Manipulation
| Autor: | Meir Orenstein, Dan Ritter, Yonatan Calahorra, Yaron Kauffmann, Shimon Cohen, Alexander Kelrich, Ofir Sorias, Ran Gladstone |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Photoluminescence Nanostructure Mechanical Engineering Nanowire Bioengineering Nanotechnology 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Epitaxy 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Electric field Indium phosphide General Materials Science 0210 nano-technology Stacking fault Wurtzite crystal structure |
| Zdroj: | Nano letters. 16(4) |
| ISSN: | 1530-6992 |
| Popis: | Quasi-two-dimensional semiconductor materials are desirable for electronic, photonic, and energy conversion applications as well as fundamental science. We report on the synthesis of indium phosphide flag-like nanostructures by epitaxial growth on a nanowire template at 95% yield. The technique is based on in situ catalyst unpinning from the top of the nanowire and its induced migration along the nanowire sidewall. Investigation of the mechanism responsible for catalyst movement shows that its final position is determined by the structural defect density along the nanowire. The crystal structure of the "flagpole" nanowire is epitaxially transferred to the nanoflag. Pure wurtzite InP nanomembranes with just a single stacking fault originating from the defect in the flagpole that pinned the catalyst were obtained. Optical characterization shows efficient highly polarized photoluminescence at room temperature from a single nanoflag with up to 90% degree of linear polarization. Electric field intensity enhancement of the incident light was calculated to be 57, concentrated at the nanoflag tip. The presented growth method is general and thus can be employed for achieving similar nanostructures in other III-V semiconductor material systems with potential applications in active nanophotonics. |
| Databáze: | OpenAIRE |
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