Exciton spectra of semiconductor clusters

Krishna, M. V. Rama; Friesner, Richard A.

doi:10.1103/physrevlett.67.629

Cited by 132 publications

(90 citation statements)

References 13 publications

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“…Ab initio calculations for a CdS cluster of about 16Å diameter [37] as well as results of Ref. [24] suggest that the present scheme is of sufficient accuracy down to about 16Å, though the applicability of this approach may be limited for still smaller sized clusters. In order to explore the possibility of utilizing it effectively, we have used this model for calculating the band gap variation over a wide range of sizes for A II B VI semiconductor nanocrystals, with A = Cd or Zn and B = S, Se or Te, comparing the calculated results with the experimental data from the literature.…”

Section: Introductionmentioning

confidence: 95%

Evolution of the electronic structure with size in II-VI semiconductor nanocrystals

2004

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In order to provide a quantitatively accurate description of the band gap variation with sizes in various II-VI semiconductor nanocrystals, we make use of the recently reported tight-binding parametrization of the corresponding bulk systems. Using the same tight-binding scheme and parameters, we calculate the electronic structure of II-VI nanocrystals in real space with sizes ranging between 5 and 80Å in diameter. A comparison with available experimental results from the literature shows an excellent agreement over the entire range of sizes.

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Section: Introductionmentioning

confidence: 95%

Evolution of the electronic structure with size in II-VI semiconductor nanocrystals

2004

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“…Single-particle states Many varying approaches to the calculation of electron and hole states in QD's have been put forward in Refs. 2,11,12,13,17,18,19,20,21, the choice of which depends on the final aim of the work. The aim here is to provide a clear and simple illustration of how to experimentally observe resonant energy transfer between a pair of QD's and how to exploit this inter-dot interaction to perform quantum logic.…”

Section: Quantum Dot Modelmentioning

confidence: 99%

Anticrossings in Förster coupled quantum dots

et al. 2005

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We consider two coupled generic quantum dots, each modelled by a simple potential which allows the derivation of an analytical expression for the inter-dot Förster coupling, in the dipole-dipole approximation. We investigate the energy level behaviour of this coupled two-dot system under the influence of an external applied electric field and predict the presence of anticrossings in the optical spectra due to the Förster interaction.

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“…This model was developed in 1991 by Wang and Herron 15 and uses experimentally obtained fitting parameters. Other models have been developed that are more specific to particular semiconductor systems such as the empirical pseudopotential method ͑EPM͒ 16 and the effective bond order model ͑EBOM͒ which includes modifications for II-VI semiconductors. 17 The EPM is not a first principle model but is a reliable technique that agrees well with experiment.…”

Section: ͑5͒mentioning

confidence: 99%

Modeling the contribution of quantum confinement to luminescence from silicon nanoclusters

Trwoga

Kenyon

Pitt

1998

Journal of Applied Physics

201

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We present a model for the luminescence spectrum of silicon nanoclusters. We propose that the major contribution to luminescence is from radiative recombination of confined excitons ͑quantum confinement͒. Utilizing the effective mass approximation we consider the variation in oscillator strength with cluster size and the associated change in the number of available free carriers. By varying both the mean cluster size and size distribution of silicon nanoclusters, the luminescence spectra are modeled to a good fit. We compare our model with experimental photoluminescence and electroluminescence data from this group and from others.

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Exciton spectra of semiconductor clusters

Cited by 132 publications

References 13 publications

Evolution of the electronic structure with size in II-VI semiconductor nanocrystals

Evolution of the electronic structure with size in II-VI semiconductor nanocrystals

Anticrossings in Förster coupled quantum dots

Modeling the contribution of quantum confinement to luminescence from silicon nanoclusters

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