Home > Articles > Published articles > High yield of gaas nanowire arrays on si mediated by the pinning and contact angle of Ga |
Additional title: | Amorphous silicon mediates a high yield in GaAs nanowire arrays on Si |
Date: | 2015 |
Abstract: | GaAs nanowire arrays on silicon offer great perspectives in the optoelectronics and solar cell industry. To fulfill this potential, gold-free growth in predetermined positions should be achieved. Ga-assisted growth of GaAs nanowires in the form of array has been shown to be challenging and difficult to reproduce. In this work, we provide some of the key elements for obtaining a high yield of GaAs nanowires on patterned Si in a reproducible way: contact angle and pinning of the Ga droplet inside the apertures achieved by the modification of the surface properties of the nanoscale areas exposed to growth. As an example, an amorphous silicon layer between the crystalline substrate and the oxide mask results in a contact angle around 90°, leading to a high yield of vertical nanowires. Another example for tuning the contact angle is anticipated, native oxide with controlled thickness. This work opens new perspectives for the rational and reproducible growth of GaAs nanowire arrays on silicon. |
Grants: | European Commission 316751 Ministerio de Economía y Competitividad MAT2014-51480-ERC Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1638 |
Note: | Títol del preprint: Amorphous silicon mediates a high yield in GaAs nanowire arrays on Si. |
Rights: | Tots els drets reservats. |
Language: | Anglès |
Document: | Article ; recerca ; Versió sotmesa a revisió |
Subject: | Arrays ; Ga-assisted GaAs nanowires ; III-V on silicon ; Molecular beam epitaxy ; Vertical nanowires |
Published in: | Nano letters, Vol. 15, issue 5 (May 2015) , p. 2869-2874, ISSN 1530-6992 |
Preprint 21 p, 1.0 MB |