Doping of silicon nanocrystals

Arduca, Elisa; Perego, Michele

doi:10.1016/j.mssp.2016.10.054

Cited by 37 publications

(27 citation statements)

References 130 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For this reason, the possibility to introduce dopants has been explored in order to improve transport and other fundamental characteristics [78,79].…”

Section: Matrix-embedded Nanocrystalsmentioning

confidence: 99%

“…The obtained results pointed out that the presence of impurities during the synthesis affects the growth kinetics of the Si-NCs, resulting in a wide size distribution that depends on the annealing temperature and on the nature and concentration of dopants. Doped Si-NCs with a diameter ranging from 2.7 to 3.8 nm, slightly larger than the corresponding undoped Si-NCs grown using the same annealing temperature, were prepared [79]. The doped Si-NCs showed good crystallinity and were well separated from each other in the matrix.…”

Section: Matrix-embedded Nanocrystalsmentioning

confidence: 99%

“…The aim of this review is to summarize the latest progress in the fascinating research field related to the understanding of the doping in Si-NCs with n-and p-type impurities. It should be pointed out that in these last few years some review articles on this topic have been published [41,78,79,89,90]. At variance with these reviews, since the role of theoretical modelings and simulations has becomed more an more important, we will give particular attention to the theoretical outcomes.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Doped and codoped silicon nanocrystals: The role of surfaces and interfaces

Marri

Degoli

Ossicini

2017

Progress in Surface Science

View full text Add to dashboard Cite

Si nanocrystals have been extensively studied because of their novel properties and their potential applications in electronic, optoelectronic, photovoltaic, thermoelectric and biological devices. These new properties are achieved through the combination of the quantum confinement of carriers and the strong influence of surface chemistry. As in the case of bulk Si the tuning of the electronic, optical and transport properties is related to the possibility of doping, in a controlled way, the nanocrystals. This is a big challenge since several studies have revealed that doping in Si nanocrystals differs from the one of the bulk. Theory and experiments have underlined that doping and codoping are influenced by a large number of parameters such as size, shape, passivation and chemical environment of the silicon nanocrystals. However, the connection between these parameters and dopant localization as well as the occurrence of self-purification effects are still not clear. In this review we summarize the latest progress in this fascinating research field considering free-standing and matrix-embedded Si nanocrystals both from the theoretical and experimental point of view, with special attention given to the results obtained by ab-initio calculations and to size-, surface- and interface-induced effects

show abstract

“…For this reason, the possibility to introduce dopants has been explored in order to improve transport and other fundamental characteristics [78,79].…”

Section: Matrix-embedded Nanocrystalsmentioning

confidence: 99%

Section: Matrix-embedded Nanocrystalsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Doped and codoped silicon nanocrystals: The role of surfaces and interfaces

Marri

Degoli

Ossicini

2017

Progress in Surface Science

View full text Add to dashboard Cite

show abstract

“…Thus one expect that intentional doping with n‐ and p‐type impurities will play a critical role for the design and realization of novel devices based on Si‐NCs. Nevertheless several studies have revealed that doping in Si‐NCs is quite different from their bulk counterparts, for example the ionization of the impurities at room temperature may be strongly quenched with respect to the bulk and a shallow impurity level in bulk may become a deep level at the nanoscale. Moreover in the case of nanocrystals there are several possible impurity locations, that is within the nanocrystals, at their surface‐interface, or in the surrounding matrix, and it is difficult from the experimental point of view to obtain information about the exact dopant location.…”

Section: Introductionmentioning

confidence: 99%

First Principle Studies of B and P Doped Si Nanocrystals

Marri

Degoli

Ossicini

2017

Physica Status Solidi (a)

View full text Add to dashboard Cite

The properties of n- and p-doped silicon nanocrystals obtained through ab initio calculations are reviewed here. The aim is the understanding of the effects induced by substitutional doping on the structural, electronic and optical properties of free-standing and matrix-embedded Si nanocrystals. The preferential positioning of the dopants and their effects on the structural properties with respect to the undoped case, as a function of the nanocrystals diameter and termination, are identified through total-energy considerations. The localization of the acceptor and donor related levels in the band gap of the Si nanocrystals, together with the impurity activation energy, are discussed as a function of the nanocrystals size. The dopant induced differences in the optical properties with respect to the undoped case are presented. Finally, the case of B and P co-doped nanocrystals is discussed showing that if carriers are perfectly compensated, the Si nanocrystals undergo a minor structural distortion around the impurities inducing a significant decrease of the impurities formation energies with respect to the single doped case. Due to co-doping, additional peaks are introduced in the absorption spectra, giving rise to a size-dependent red shift of the absorption spectra

show abstract

“…It can be said that the effective passivation of silicon clusters (not only by hydrogen atoms) and diluting the silicon framework with the other atoms (e.g., germanium) to change their initial characteristics is an actual modern problem (see Refs. [ ]). In the presented study, we restrict ourselves to hydrogen doped silicon clusters Si 18 H 12 and Si 19 H 12 either pure or endohedral.…”

Section: Introductionmentioning

confidence: 99%

Silicon buckyballs versus prismanes: Influence of spatial confinement on the structural properties and optical spectra of the Si₁₈H₁₂ and Si₁₉H₁₂ clusters

Gordeychuk

Katin²,

Гришаков³

et al. 2018

Int J of Quantum Chemistry

View full text Add to dashboard Cite

The genetic algorithm is combined with the density functional theory to predict how the cylindrical spatial confinement affects the structural characteristics and optical adsorption spectra of the low‐energy Si18H12 and Si19H12 isomers. Retrieved ground states (minimum energy states) of Si18H12 and Si19H12 isomers significantly differ from the earlier proposed “ultrastable” aromatic molecular systems and prismanes. According to our calculations, they are represented by the almost spherical endohedral buckyballs. In contrast to pure silicic clusters (Si18 or Si19), the most of Si atoms in the low‐energy Si18H12 and Si19H12 are four‐coordinated. Spatial confinement results in more oblong structures with the different optical spectra. Prismanes under confinement get some energy advantages over the spherical structures, but despite this they do not become the most energetically favorable ones. Thus, the current results warrant however further research on the spatial confinement of silicic prismanes, as our study suggests challenges in devising the method of their synthesis without additional chemical techniques.

show abstract

Doping of silicon nanocrystals

Cited by 37 publications

References 130 publications

Doped and codoped silicon nanocrystals: The role of surfaces and interfaces

Doped and codoped silicon nanocrystals: The role of surfaces and interfaces

First Principle Studies of B and P Doped Si Nanocrystals

Silicon buckyballs versus prismanes: Influence of spatial confinement on the structural properties and optical spectra of the Si₁₈H₁₂ and Si₁₉H₁₂ clusters

Contact Info

Product

Resources

About

Doping of silicon nanocrystals

Cited by 37 publications

References 130 publications

Doped and codoped silicon nanocrystals: The role of surfaces and interfaces

Doped and codoped silicon nanocrystals: The role of surfaces and interfaces

First Principle Studies of B and P Doped Si Nanocrystals

Silicon buckyballs versus prismanes: Influence of spatial confinement on the structural properties and optical spectra of the Si18H12 and Si19H12 clusters

Contact Info

Product

Resources

About

Silicon buckyballs versus prismanes: Influence of spatial confinement on the structural properties and optical spectra of the Si₁₈H₁₂ and Si₁₉H₁₂ clusters