Exciton spectra of semiconductor clusters

The band gaps and exciton energies of CdS and GaP clusters are calculated for the first time using pseudopotentials. The calculated exciton energies of CdS over a wide range of cluster sizes are in excellent agreement with experiment. Furthermore, the exciton states of clusters with zinc-blende and...

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Bibliographic Details
Published in:Physical review letters 1991-07, Vol.67 (5), p.629-632
Main Authors: RAMA KRISHNA, M. V, FRIESNER, R. A
Format: Article
Language:English
Subjects:
360603 - Materials- Properties
CADMIUM COMPOUNDS
CADMIUM SULFIDES
CHALCOGENIDES
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
EXCITONS
Excitons and related phenomena
GALLIUM COMPOUNDS
GALLIUM PHOSPHIDES
INORGANIC PHOSPHORS
LATTICE PARAMETERS
MATERIALS
MATERIALS SCIENCE
PHOSPHIDES
PHOSPHORS
PHOSPHORUS COMPOUNDS
Physics
PNICTIDES
QUASI PARTICLES
RELAXATION
SEMICONDUCTOR MATERIALS
SOLID CLUSTERS
SULFIDES
SULFUR COMPOUNDS
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Summary:The band gaps and exciton energies of CdS and GaP clusters are calculated for the first time using pseudopotentials. The calculated exciton energies of CdS over a wide range of cluster sizes are in excellent agreement with experiment. Furthermore, the exciton states of clusters with zinc-blende and hexagonal lattices are similar in large clusters, but differ dramatically in small clusters. Finally, the spectra of small GaP clusters shift to red, instead of to the blue, with decreasing cluster size. These effects provide novel ways of tuning the optical properties of clusters.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.67.629