Superlattice Nanowire Pattern Transfer (SNAP)
- 4 July 2008
- journal article
- Published by American Chemical Society (ACS) in Accounts of Chemical Research
- Vol. 41 (12), 1609-1617
- https://doi.org/10.1021/ar800015y
Abstract
During the past 15 years or so, nanowires (NWs) have emerged as a new and distinct class of materials. Their novel structural and physical properties separate them from wires that can be prepared using the standard methods for manufacturing electronics. NW-based applications that range from traditional electronic devices (logic and memory) to novel biomolecular and chemical sensors, thermoelectric materials, and optoelectronic devices, all have appeared during the past few years. From a fundamental perspective, NWs provide a route toward the investigation of new physics in confined dimensions. Perhaps the most familiar fabrication method is the vapor−liquid−solid (VLS) growth technique, which produces semiconductor nanowires as bulk materials. However, other fabrication methods exist and have their own advantages. In this Account, I review a particular class of NWs produced by an alternative method called superlattice nanowire pattern transfer (SNAP). The SNAP method is distinct from other nanowire preparation methods in several ways. It can produce large NW arrays from virtually any thin-film material, including metals, insulators, and semiconductors. The dimensions of the NWs can be controlled with near-atomic precision, and NW widths and spacings can be as small as a few nanometers. In addition, SNAP is almost fully compatible with more traditional methods for manufacturing electronics. The motivation behind the development of SNAP was to have a general nanofabrication method for preparing electronics-grade circuitry, but one that would operate at macromolecular dimensions and with access to a broad materials set. Thus, electronics applications, including novel demultiplexing architectures; large-scale, ultrahigh-density memory circuits; and complementary symmetry nanowire logic circuits, have served as drivers for developing various aspects of the SNAP method. Some of that work is reviewed here. As the SNAP method has evolved into a robust nanofabrication method, it has become an enabling tool for the investigation of new physics. In particular, the application of SNAP toward understanding heat transport in low-dimensional systems is discussed. This work has led to the surprising discovery that Si NWs can serve as highly efficient thermoelectric materials. Finally, we turn toward the application of SNAP to the investigation of quasi-one-dimensional (quasi-1D) superconducting physics in extremely high aspect ratio Nb NWs.Keywords
This publication has 44 references indexed in Scilit:
- Encoding Electronic Properties by Synthesis of Axial Modulation-Doped Silicon NanowiresScience, 2005
- Epitaxially grown GaP/GaAs1−xPx/GaP double heterostructure nanowires for optical applicationsNanotechnology, 2005
- The Chemistry and Physics of Semiconductor NanowiresMRS Bulletin, 2005
- Growth of GaP nanotree structures by sequential seeding of 1D nanowiresJournal of Crystal Growth, 2004
- Fabrication of conducting Si nanowire arraysJournal of Applied Physics, 2004
- Ultrahigh-Density Nanowire Lattices and CircuitsScience, 2003
- Block-by-Block Growth of Single-Crystalline Si/SiGe Superlattice NanowiresNano Letters, 2002
- A Laser Ablation Method for the Synthesis of Crystalline Semiconductor NanowiresScience, 1998
- Template-Synthesized Nanoscopic Gold Particles: Optical Spectra and the Effects of Particle Size and ShapeThe Journal of Physical Chemistry, 1994
- A liquid solution synthesis of single crystal germanium quantum wiresChemical Physics Letters, 1993