Open Access Nano Express

A general lithography-free method of microscale/nanoscale fabrication and patterning on Si and Ge surfaces

Huatao Wang12 and Tom Wu1*

Author Affiliations

1 Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore

2 School of Materials Science and Engineering, Harbin Institute of Technology in Weihai, Weihai, 264209, China

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Nanoscale Research Letters 2012, 7:110  doi:10.1186/1556-276X-7-110

Published: 8 February 2012

Abstract

Here, we introduce and give an overview of a general lithography-free method to fabricate silicide and germanide micro-/nanostructures on Si and Ge surfaces through metal-vapor-initiated endoepitaxial growth. Excellent controls on shape and orientation are achieved by adjusting the substrate orientation and growth parameters. Furthermore, micro-/nanoscale pits with controlled morphologies can also be successfully fabricated on Si and Ge surfaces by taking advantage of the sublimation of silicides/germanides. The aim of this brief report is to illustrate the concept of lithography-free synthesis and patterning on surfaces of elemental semiconductors, and the differences and the challenges associated with the Si and the Ge surfaces will be discussed. Our results suggest that this low-cost bottom-up approach is promising for applications in functional nanodevices.

Keywords:
lithography-free patterning; nanostructures; pits; silicides; germanides