Facet-Dependent Electrical Conductivity Properties of Cu2O Crystals
- 25 February 2015
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 15 (3), 2155-2160
- https://doi.org/10.1021/acs.nanolett.5b00150
Abstract
It is interesting to examine facet-dependent electrical properties of single Cu2O crystals, because such study greatly advances our understanding of various facet effects exhibited by semiconductors. We show a Cu2O octahedron is highly conductive, a cube is moderately conductive, and a rhombic dodecahedron is nonconductive. The conductivity differences are ascribed to the presence of a thin surface layer having different degrees of band bending. When electrical connection was made on two different facets of a rhombicuboctahedron, a diode-like response was obtained, demonstrating the potential of using single polyhedral nanocrystals as functional electronic components. Density of state (DOS) plots for three layers of Cu2O (111), (100), and (110) planes show respective metallic, semimetal, and semiconducting band structures. By examining DOS plots for varying number of planes, the surface layer thicknesses responsible for the facet-dependent electrical properties of Cu2O crystals have been determined to be below 1.5 nm for these facets.Keywords
Funding Information
- Ministry of Science and Technology, Taiwan (101-2221-E-007-078, 101-2628-M-007-006, 102-2633-M-007-002)
This publication has 32 references indexed in Scilit:
- Band Bending in Semiconductors: Chemical and Physical Consequences at Surfaces and InterfacesChemical Reviews, 2012
- Investigation of the Effects of Polyhedral Gold Nanocrystal Morphology and Facets on the Formation of Au–Cu2O Core–Shell HeterostructuresChemistry of Materials, 2011
- Facet-Dependent and Au Nanocrystal-Enhanced Electrical and Photocatalytic Properties of Au−Cu2O Core−Shell HeterostructuresJournal of the American Chemical Society, 2010
- Facile Assembly of Size- and Shape-Tunable IV−VI Nanocrystals into SuperlatticesLangmuir, 2010
- Synthesis of Ag2O Nanocrystals with Systematic Shape Evolution from Cubic to Hexapod Structures and Their Surface PropertiesChemistry – A European Journal, 2010
- Centimeter‐Long V2O5 Nanowires: From Synthesis to Field‐Emission, Electrochemical, Electrical Transport, and Photoconductive PropertiesAdvanced Materials, 2010
- Shape-Dependent Antibacterial Activities of Ag2O Polyhedral ParticlesLangmuir, 2009
- Synthesis of Submicrometer-Sized Cu2O Crystals with Morphological Evolution from Cubic to Hexapod Structures and Their Comparative Photocatalytic ActivityThe Journal of Physical Chemistry C, 2009
- Generalized Gradient Approximation Made SimplePhysical Review Letters, 1996
- Inhomogeneous Electron GasPhysical Review B, 1964