Hill and Whaley Reply:

Na, Hill; Kb, Whaley

doi:10.1103/physrevlett.76.3039

Cited by 36 publications

(55 citation statements)

References 11 publications

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“…This assumption is also supported by the good agreement with the tight-binding results of Delerue et al 5 This calculation was made with a higher-quality empirical parametrization for bulk Si than that used by Hill and Whaley, which accounts for the difference between the two theoretical curves. 25,26 Although our results agree well with the quantum confinement theory, there is a problem with the film grown from the smallest clusters with a mean diameter of 2.5 nm. Considering the theoretical and experimental work known so far, we would expect luminescence around 2.2 eV.…”

Section: Discussioncontrasting

confidence: 48%

Photoluminescence and resonant Raman spectra of silicon films produced by size-selected cluster beam deposition

Ehbrecht¹,

Kohn²,

Huisken³

et al. 1997

Phys. Rev. B

178

103

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Silicon clusters and nanocrystals have been generated by CO 2 -laser-induced decomposition of SiH 4 in a flow reactor. By introducing a conical nozzle into the reaction zone, the clusters are extracted into a molecularbeam machine and analyzed with a time-of-flight mass spectrometer ͑TOFMS͒. Since the clusters have a size-dependent velocity, a mechanical velocity selector is used to further narrow their size distribution and to select a specific mean size. Employing this technique, silicon clusters with different preselected mean sizes have been deposited at low energy on various substrates. Photoluminescence ͑PL͒ and resonant Raman spectra of the resulting films are presented. The crystallite sizes deduced from the Raman spectra confirm the TOFMS measurements. The PL spectra are shifted with decreasing cluster size to smaller wavelengths. Our results agree very well with theoretical predictions for silicon quantum dots. ͓S0163-1829͑97͒08035-1͔

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Section: Discussioncontrasting

confidence: 48%

Photoluminescence and resonant Raman spectra of silicon films produced by size-selected cluster beam deposition

Ehbrecht¹,

Kohn²,

Huisken³

et al. 1997

Phys. Rev. B

178

103

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“…The second band is attributed by the authors to the photoluminescence of FeSi 2 , a direct-band gap semiconductor. The first band, however, could be due to silicon nanocrystals since, at low temperature, the recombination of the electron-hole pair on dangling bonds becomes radiative (Hill & Whaley 1996a;Hill & Whaley 1996b;Meyer et al 1993;Gardelis & Hamilton 1994). The energy (in eV) of the emission E p (IR) is then related to the normal photoluminescence energy E p (ERE) according to E p (IR) = 0.43E p (ERE) + 0.34.…”

Section: Other Spectroscopic Signaturesmentioning

confidence: 99%

Crystalline silicon nanoparticles as carriers for the Extended Red Emission

Ledoux

Guillois

Huisken³

et al. 2001

A&A

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Abstract.In an attempt to determine the carrier of the Extended Red Emission (ERE), we have investigated a series of amorphous and crystalline materials: natural coal, amorphous hydrogenated carbon, amorphous hydrogenated silicon carbide, porous silicon, and crystalline silicon nanoparticles. The photoluminescence (PL) behavior of various samples of these materials upon excitation with UV light was studied at room temperature focusing on both the wavelength dependence of the photoluminescence and the PL yield. For some samples the yield is by far too low, other samples do not comply with the characteristic wavelength range of ERE. Only the samples of nanocrystalline silicon (porous silicon and silicon nanoparticles) reveal PL properties that are compatible with the astronomical observations. Besides this experimental evidence, we will supply additional arguments leading to the conclusion that silicon nanoparticles should be seriously considered as an attractive carrier for the Extended Red Emission.

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“…However, disagreements among different theoretical models used for describing electronic excitations in these systems remain a subject of significant controversy. For the most part, the disagreements arise from the formulation of the optical gap in confined systems and the calculation of different components such as image charges, self-energies, and excitonic contributions that compose the optical gap [13,14].Most theoretical studies focus primarily on the size dependence of photoluminescence energies and photoabsorption gaps [5][6][7][8][9][10][11]. In many cases, such calculations do not evaluate oscillator strengths and cannot explicitly identify optically allowed and dark transitions.…”

mentioning

confidence: 99%

Ab InitioAbsorption Spectra and Optical Gaps in Nanocrystalline Silicon

2001

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The optical absorption spectra of Si(n)H(m) nanoclusters up to approximately 250 atoms are computed using a linear response theory within the time-dependent local density approximation (TDLDA). The TDLDA formalism allows the electronic screening and correlation effects, which determine exciton binding energies, to be naturally incorporated within an ab initio framework. We find the calculated excitation energies and optical absorption gaps to be in good agreement with experiment in the limit of both small and large clusters. The TDLDA absorption spectra exhibit substantial blueshifts with respect to the spectra obtained within the time-independent local density approximation.

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Hill and Whaley Reply:

Cited by 36 publications

References 11 publications

Photoluminescence and resonant Raman spectra of silicon films produced by size-selected cluster beam deposition

Photoluminescence and resonant Raman spectra of silicon films produced by size-selected cluster beam deposition

Crystalline silicon nanoparticles as carriers for the Extended Red Emission

Ab InitioAbsorption Spectra and Optical Gaps in Nanocrystalline Silicon

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