Effect of the size-induced structural transformation on the band gap in CdS nanoparticles
- 28 November 2000
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 12 (50), 10647-10654
- https://doi.org/10.1088/0953-8984/12/50/325
Abstract
The interrelation between particle size, crystal structure and optical properties in semiconductor quantum dots has elicited widespread interest. We report the first attempt at relating the size-induced transformation from a hexagonal to a cubic structure in CdS nanoparticles to a change in the band gap. CdS nanoparticles with particle size in the 0.7-10 nm range were prepared by chemical precipitation using thiophenol as a capping agent. Whereas the band gap for bulk hexagonal CdS is about 2.5 eV, that for 1 nm cubic CdS nanoparticles was found to be almost 3.9 eV. We also suggest a simple mechanism (based on the periodic insertion of stacking faults) for the transformation from the cubic zinc blende structure to the hexagonal wurtzite structure.Keywords
This publication has 18 references indexed in Scilit:
- Photoelectron spectroscopic study of CdS nanocrystallitesPhysical Review B, 1999
- Effect of different capping environments on the optical properties of CdS nanoparticles in reverse micellesInternational Journal of Quantum Chemistry, 1999
- Epitaxial growth of ZnS on CdS in CdS/ZnS nanostructuresThin Solid Films, 1998
- Size Dependence of Structural Metastability in Semiconductor NanocrystalsScience, 1997
- Perspectives on the Physical Chemistry of Semiconductor NanocrystalsThe Journal of Physical Chemistry, 1996
- Structural phase behavior in II–VI semiconductor nanoparticlesApplied Physics Letters, 1995
- CdS Nanoclusters: Synthesis, Characterization, Size Dependent Oscillator Strength, Temperature Shift of the Excitonic Transition Energy, and Reversible Absorbance ShiftThe Journal of Physical Chemistry, 1994
- Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymerNature, 1994
- Synthesis and characterization of surface-capped, size-quantized cadmium sulfide clusters. Chemical control of cluster sizeJournal of the American Chemical Society, 1990
- Some properties of thin films of chemically deposited cadmium sulphideSolar Energy Materials, 1985