A photoemission investigation of compound semiconductor monodisperse clusters
- Lawrence Livermore National Lab., CA (USA)
- California Univ., Berkeley, CA (USA)
We have used synchrotron radiation photoemission to probe the valence and core level electronic structure of compound-semiconductor monodisperse clusters (nanocrystals). These clusters exhibited a 10% or less variation relative to the mean diameter and were attached to the metal substrates via alkane chains. Direct evidence of gap broadening due to size variation in CdS clusters was observed. The novel utilization of alkane chain attachment is the key to eliminating the otherwise debilitating problem of sample charging, as occurs with powders. The quality of sample preparation was confirmed by other methods such as transmission electron microscopy, Raman scattering and x-ray diffraction. This work provides a direct link between photoemission studies of expitaxial ultra-thin films of compound semiconductors, the photon-spectroscopy measurements of cluster powders and the existing theories of quantum confinement in reduced dimensionality structures. 5 refs., 2 figs.
- Research Organization:
- Lawrence Livermore National Lab., CA (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6244150
- Report Number(s):
- UCRL-JC-103724; CONF-901035--17; ON: DE91006707
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603 -- Materials-- Properties
656002* -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BREMSSTRAHLUNG
CADMIUM COMPOUNDS
CADMIUM SULFIDES
CHALCOGENIDES
CHEMICAL PREPARATION
CRYSTALS
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
EMISSION
INORGANIC PHOSPHORS
MATERIALS
PHOSPHORS
PHOTOEMISSION
RADIATIONS
SECONDARY EMISSION
SEMICONDUCTOR MATERIALS
SULFIDES
SULFUR COMPOUNDS
SYNCHROTRON RADIATION
SYNTHESIS