Binding energy and diamagnetic susceptibility of an on-center hydrogenic donor impurity in a spherical quantum dot placed at the center of a cylindrical nano-wire

Safarpour, Gh.; Barati, Mansoor; Moradi, Mahmood; Davatolhagh, S.; Zamani, Ali

doi:10.1016/j.spmi.2012.05.005

Cited by 34 publications

(5 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This discrepancy can be explained as follows: (1) the electron is spatially more confined than the size decrease of the QDs suggests, which results in increasing the binding energy of the exciton and band gap energy. However, previous research reported that any further decrease in the size of the QDs leads to the reduction of the exciton binding energy and leakage of electrons out of the QDs. − In the case of Sn 12 , the band gap energy is assumed to be lower than that of the theoretical model because the leakage of the electron significantly occurs around this size. (2) The periodic potential of the tin oxide crystal disappears with the decreasing size, and it is assumed that the Sn 12 oxide QDs might contain no crystal moiety as described by the DFT calculations.…”

Section: Resultsmentioning

confidence: 99%

Dendrimer-Templated Synthesis and Characterization of Tin Oxide Quantum Dots Deposited on a Silica Glass Substrate

Inomata

Albrecht²,

Haruta

et al. 2019

Chem. Mater.

View full text Add to dashboard Cite

Tin oxide quantum dots (QDs) have attracted much attention because of their low toxicity and the absence of cadmium and other poisonous elements. In this paper, we report the novel synthetic method for size-controlled tin oxide QDs using dendrimers as a template, and their electronic and structural properties. Hemispherical tin oxide QDs with a size below 2 nm and small size distribution were synthesized on silica glass substrates by the dendrimer-templated synthesis method (Sn 12 , Sn 28 , and Sn 60 oxide QDs). The structures of the tin oxide QDs were composed not only of Sn(IV) sites, but also Sn(II) sites due to the restriction of the coordination environment to stabilize the structure. Density functional theory calculation showed that a bare tin oxide cluster with a mixed valence state (Sn(II) + Sn(IV)) is more stable than those only with Sn(II) or Sn(IV). The synthesized tin oxide QDs showed the quantum confinement effect caused by the spatial confinement of an electron. The Urbach tail parameter, expressing the disorderliness of the QDs, decreased with the reduced QD size, although the value of each tin oxide QD was higher than that of bulk SnO 2 . The experimental band gap energy was compared with the effective mass approximation models, which are theoretical models for the quantum confinement effect. We found that the experimental values of Sn 28 and Sn 60 oxide QDs were consistent with the theoretical values, while Sn 12 oxide QDs had a lower value compared to the predicted band gap energy. This could be attributed to the change in the physical parameters of Sn 12 oxide QDs, which are not the same as those of Sn 28 , Sn 60 oxide QDs or the bulk SnO 2 . These results indicate that small tin oxide QDs have a different structure and different electronic properties compared to bulk or conventional nanoparticles and have potential applications in such fields as catalysis and optical and electronic devices.

show abstract

Section: Resultsmentioning

confidence: 99%

Dendrimer-Templated Synthesis and Characterization of Tin Oxide Quantum Dots Deposited on a Silica Glass Substrate

Inomata

Albrecht²,

Haruta

et al. 2019

Chem. Mater.

View full text Add to dashboard Cite

show abstract

“…For example, the authors of the following article [29] have studied the effects of impurities and external fields on nonlinear optical rectification. The diamagnetic susceptibility (DS) is one of the most interesting magnetic properties of a QD with a hydrogenic impurity, as such, it is a widely studied topic [32][33][34][35]. The authors of the following work have investigated the DS and binding energies in GaN/AlGaN QD's with and without the Zeeman effect [33].…”

Section: Introductionmentioning

confidence: 99%

Impurity effects on binding energy, diamagnetic susceptibility and photoionization cross-section of chalcopyrite AgInSe₂ nanotadpole

Mantashian

Hayrapetyan

2022

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Recently the interest in chalcopyrite semiconductor nanostructures has increased because of their non-toxicity and their wide direct bandgap. Likewise, structures with non-trivial geometry are particularly interesting because of their electronic, optical, and magnetic properties. In the current article, the finite element method was used in conjunction with the effective mass approximation to theoretically investigate the properties of a chalcopyrite AgInSe2 nanotadpole in the presence of an hydrogen like shallow off-center impurity. The morphology of the nanotadpole gives it excellent hydrodynamic properties and is ideal for a wide range of applications. The probability densities for various impurity positions and energy levels were obtained. The results suggested a strong dependence of the behavior of the electron on the impurity positions and the orientation of the wave function. The investigation of the nanotadpole’s energy spectra and their comparison with the cylindrical and spherical quantum dots suggest that the spectrum has degenerate states similar to the spherical case, however at some ranges, the levels behave similarly to the cylindrical case. The binding energy's dependence on the nanotadpole's size and the impurity position was obtained. The dependence of the diamagnetic susceptibility on the impurity position was calculated. An extensive investigation of the photoionization cross-section was carried out for the ground and the first two excited states as the initial states and the first twenty excited states as the final states.

show abstract

“…Apart from this, works on magnetic properties of LDSS deem importance in view of the development of spintronics, elucidation of electronic structure of LDSS [35], understanding the semiconductor-metal transitions in LDSS [41] and so on so forth. Impurity contamination to LDSS makes its magnetic properties more delicate [42][43][44][45][46][47][48][49][50][51][52][53].…”

Section: Introductionmentioning

confidence: 99%

Magnetic susceptibility of doped quantum dots: interplay between binding energy and noise

2020

Biointerface Res Appl Chem

View full text Add to dashboard Cite

Current work focuses on realizing how the interaction between binding energy(BE) and noise influences the magnetic susceptibility(χ) of doped GaAs quantum dot (QD). The system is exposed to Gaussian white noise and the dopant is also characterized by a Gaussian function. The work also highlights the role of the pathway via which noise may operate in the system. We have found that it is the multiplicative noise that alters the χ profile significantly from that of a noise-free atmosphere. However, additive noise does not change the χ profile from that under noise-free state to any meaningful size. Often multiplicative noise induces paramagnetism in the system which otherwise shows diamagnetism. And the noise-BE interplay prominently determines the extent of diamagnetism displayed by the system.

show abstract

Binding energy and diamagnetic susceptibility of an on-center hydrogenic donor impurity in a spherical quantum dot placed at the center of a cylindrical nano-wire

Cited by 34 publications

References 54 publications

Dendrimer-Templated Synthesis and Characterization of Tin Oxide Quantum Dots Deposited on a Silica Glass Substrate

Dendrimer-Templated Synthesis and Characterization of Tin Oxide Quantum Dots Deposited on a Silica Glass Substrate

Impurity effects on binding energy, diamagnetic susceptibility and photoionization cross-section of chalcopyrite AgInSe₂ nanotadpole

Magnetic susceptibility of doped quantum dots: interplay between binding energy and noise

Contact Info

Product

Resources

About

Binding energy and diamagnetic susceptibility of an on-center hydrogenic donor impurity in a spherical quantum dot placed at the center of a cylindrical nano-wire

Cited by 34 publications

References 54 publications

Dendrimer-Templated Synthesis and Characterization of Tin Oxide Quantum Dots Deposited on a Silica Glass Substrate

Dendrimer-Templated Synthesis and Characterization of Tin Oxide Quantum Dots Deposited on a Silica Glass Substrate

Impurity effects on binding energy, diamagnetic susceptibility and photoionization cross-section of chalcopyrite AgInSe2 nanotadpole

Magnetic susceptibility of doped quantum dots: interplay between binding energy and noise

Contact Info

Product

Resources

About

Impurity effects on binding energy, diamagnetic susceptibility and photoionization cross-section of chalcopyrite AgInSe₂ nanotadpole