The Optical and Electrical Properties of CdSe Nanoparticles

Rosmani, C.H.; Zainurul, A.Z.; Rusop, M.; Abdullah, Saifollah

doi:10.4028/www.scientific.net/amr.832.557

Cited by 9 publications

(8 citation statements)

References 18 publications

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“…Cadmium selenide is interesting as a material with a band gap comparable to the photon energy of visible light (1.7-1.8 eV). There are a large number of works, which describe the electronic properties of quantum dots based on CdSe nanoparticles, which can be used as elements of high-resolution optical systems [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] . In particular, X-ray diffraction analysis indicates [15] that the structure of CdSe nanoparticles with sizes of 2.8 nm, 4.1 nm and 5.6 nm is wurtzite-like, and the energy gaps E gap for these particles are 2.5 eV, 2.2 eV, and 2.0 eV, respectively.…”

Section: Introductionmentioning

confidence: 99%

Total Energy and Electronic States of CdSe Nanoparticles

Zavodinsky

Gorkusha

Kuzmenko

2022

semicond. sci. and inf. n.a.

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The authors fulfilled calculations of the total energy and electronic states of CdnSen nanoparticle:“wurzite”, “sphalerite” and “rock-salt” types of the structure. It was shown that at n ≤ 72 the “rock-salt” type is the most favorable energetically. However the extrapolation of the behavior of the energy per Cd-Se atomic pair shows that for n > 130 (corresponding to a size of about 2 nm), particles with a “wurtzite” structure can be more advantageous. Particles of the “wurtzite” and “rock-salt” types have an electronic structure with an energy gap. For particles with the “wurtzite”structure, the gap width decreases with increasing particle size: from 3.3 eV to 2.2 eV as the particle increases from 0.5 nm to 1.5 nm. For particles of the “rock-salt” type, the gap width grows slightly, remaining about 3 eV.“Sphalerite”-type particles have a metal-like electronic structure.

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Section: Introductionmentioning

confidence: 99%

Total Energy and Electronic States of CdSe Nanoparticles

Zavodinsky

Gorkusha

Kuzmenko

2022

semicond. sci. and inf. n.a.

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“…In this work, a sample of cadmium selenide (CdSe) was analyzed, which is a very popular material in this area because it has a band gap energy of 1.74 eV (Ref. 4).…”

Section: Introductionmentioning

confidence: 99%

Cadmium selenide by XPS

Ospina

Rincón‐Ortiz

Rodríguez‐Pereira

2020

Surface Science Spectra

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Cadmium selenide was analyzed using x-ray photoelectron spectroscopy (XPS). The specimen is a powder purchased from Chemsavers. Sample was fixed to a stainless-steel sample holder with copper 3M TM double-sided adhesive tape. Survey spectra, Cd 3d, Se 3d, O 1s, Cd 3p, Cd MNN, Se LMM, Se 3p, C 1s, and Cd 4d core level along with the valence band spectra were recorded. Results point out a stoichiometry of 0.95 on surface.

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“…Cadmium selenides and cadmium sulfides (CdSe and CdS), semiconductors with band gaps of about 1.8 eV and 2.4 eV, respectively are promising materials for optoelectronic devices [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] . X-ray diffraction analysis indicates that the structure of CdSe nanoparticles with sizes of 2.8 nm, 4.1 nm and 5.6 nm is wurtzite-like, and the energy gaps E gap for these particles are 2.5 eV, 2.2 eV, and 2.0 eV, respectively [6] .…”

Section: Introductionmentioning

confidence: 99%

Electronic Structure of CdS Nanoparticles and CdSe/CdS Nanosystems

Zavodinsky

Gorkusha

Kuz'menko

2022

semicond. sci. and inf. n.a.

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The electronic states of “wurtzite” CdS nanoparticles and CdSe/CdS nanosystems with up to 80 pairs of Cd-Se or CdS atoms were calculated.The results for CdS particles were compared with the results obtained earlier for CdSe particles of the same size and with published calculations of other authors. The calculated gap values in the range of 2.84 eV ~ 3.78 eV are typical for CdS particles of studied sizes in accordance with results of published data. The CdSe/CdS nanosystems were considered as layered ones and as quantum dots. The layered CdSe/CdS systems with twolayer CdS coverings can be interpreted in terms of combinations of two semiconductors with different energy band gaps (2.6 eV and 3.3 eV), while analogous systems with single-layer CdS coverings do not demonstrate a two-gap electron structure. Simulation of a CdSe/CdS quantum dot shows that the single-layer CdS shell demonstrates a tendency for the formation of the electronic structure with two energy gaps: approximately of 2.5 eV and 3.0 eV.

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The Optical and Electrical Properties of CdSe Nanoparticles

Cited by 9 publications

References 18 publications

Total Energy and Electronic States of CdSe Nanoparticles

Total Energy and Electronic States of CdSe Nanoparticles

Cadmium selenide by XPS

Electronic Structure of CdS Nanoparticles and CdSe/CdS Nanosystems

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