Visible photoluminescence of silicon-based nanostructures: Porous silicon and small silicon-based clusters

Kanemitsu, Yoshihiko; Suzuki, Katsunori; Uto, Hiroshi; Masumoto, Yasuaki; Matsumoto, Takahiro; Kyushin, Soichiro; Higuchi, Kei; Matsumoto, Hideyuki

doi:10.1063/1.108147

Cited by 81 publications

(15 citation statements)

References 18 publications

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“…The results presented here are in general agreement with experimental [13] and theoretical [14] observations of optical spectra for chains of silicon atoms. It has been found that light absorption on chains consisting of small number of Si atoms (n ≤ 20) occurs at higher energies than in longer structures.…”

Section: Calculated Electronic and Optical Propertiessupporting

confidence: 80%

“…It has been found that light absorption on chains consisting of small number of Si atoms (n ≤ 20) occurs at higher energies than in longer structures. When the number of atoms in the chains increases, the energy absorption tends to a constant value (n ≥ 80) [13]. Here, we find the same qualitative behavior in 2 .…”

Section: Calculated Electronic and Optical Propertiessupporting

confidence: 72%

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Size dependence of the optical properties of silicon clusters

Noguez

Song

Ulloa

et al. 1996

Superlattices and Microstructures

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Section: Calculated Electronic and Optical Propertiessupporting

confidence: 80%

Section: Calculated Electronic and Optical Propertiessupporting

confidence: 72%

Size dependence of the optical properties of silicon clusters

Noguez

Song

Ulloa

et al. 1996

Superlattices and Microstructures

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“…26 Figure 3 shows the square root of the PLE intensity versus the excitation energy for the closepacked SiC nanocrystal film. 26 Figure 3 shows the square root of the PLE intensity versus the excitation energy for the closepacked SiC nanocrystal film.…”

mentioning

confidence: 99%

UV-blue photoluminescence from close-packed SiC nanocrystal film

Fan

Wang

et al. 2011

Applied Physics Letters

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We observed stable photoluminescence from close-packed cubic SiC nanocrystals that are self-assembled into thin solid film. The peak wavelength shifts from blue to near UV with increasing excitation energy and follows well the quantum-confinement effect. The photoluminescence excitation spectrum indicates a 3.47 eV bandgap corresponding to a particle size of 2.3 nm. The nanocrystal film shows triple-exponential photoluminescence decay with lifetimes of 2.3, 8.5, and 36.9 ns. The results open the possibility of the solid state UV-blue light emitting by use of the SiC nanocrystals in photonics and photonics/electronics integration.

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“…Because the local Si structures can be controlled in chemically synthesized Si polymers, studies of optical properties of Si polymers with different backbone structures help to understand the electronic structures and the microscopic PL mechanisms in a variety of Si-based materials. Moreover, studies of optical properties of small Si clusters help to understand the dimension effects on electronic properties of Si-based nanostructure, and the mechanism of visible PL in nanometer-size Si crystallites such as porous Si (5).…”

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confidence: 99%

Optical Properties of Silicon-Based Polymers with Different Backbone Structures

Suzuki

Kanemitsu

Kyushin

et al. 1995

ACS Symposium Series

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We have studied optical properties of quasi-one-dimensional Si backbone polymers and small Si clusters with eight Si atoms. The branch and ladder Si polymers whose backbones are constructed of the organosilicon units having three Si-Si bonds exhibit broad photoluminescence (PL) spectra. These PL characteristics are entirely different from those of the chain structure constructed of the organosilicon units having two Si-Si bonds only. Weak visible PL in Si based materials is caused by the introduction of Si atoms with three Si-Si bonds into the Si backbone. Moreover, even in small Si 8 clusters, the PL spectra strongly depend on the shape of the clusters. In the cubic structure, the weak and temperature -sensitive PL originates from the radiative recombination of triplet excitons. Silicon-based polymers and clusters exhibit a wealth of unique optical phenomena.Optical and electronic properties of low-dimensional semiconductor nanostructures have attracted much attention, because they exhibit new quantum phenomena and have potentials for becoming novel and future optoelectronic devices (2,2). In exploring new optoelectronic materials and devices, a great deal of research effort is focused on reducing the dimensionality of the electronic structures. In this sense, chemically synthesized semiconducting polymers are regarded as natural quantum wires whose unique properties are primarily attributed to the quantum confinement effect on the conjugated electrons delocalized in the onedimensional (ID) polymer backbone chains. The polysilanes, σ-conjugated polymers, are well-known as ID silicon-based materials that have alkyl or aryl groups in their side chains (3).Although the highly hydrogenated amorphous silicon (a-Si:H) also contains Si chains, there are many differences in optical properties between a-0097-6156/94/0579-0425$08.00/0

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Visible photoluminescence of silicon-based nanostructures: Porous silicon and small silicon-based clusters

Cited by 81 publications

References 18 publications

Size dependence of the optical properties of silicon clusters

Size dependence of the optical properties of silicon clusters

UV-blue photoluminescence from close-packed SiC nanocrystal film

Optical Properties of Silicon-Based Polymers with Different Backbone Structures

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