Quantum size effects in PbSe quantum wells

Рогачева, Е. И.; Tavrina, T. V.; Nashchekina, O. N.; Grigorov, S. N.; Nasedkin, K. A.; Dresselhaus, M. S.; Cronin, Stephen B.

doi:10.1063/1.1469677

Cited by 72 publications

(59 citation statements)

References 35 publications

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“…But it should be noticed that experimental oscillation amplitudes in ddependences of thermoelectric parameters are much more large than the theoretical one. We consider that this difference has place because of assumption of infinite barrier height, what is confirmed by the data in [14], where for Te Eu PbTe/Pb x x 1− quantum wells it was found that energy barrier height reduction leads to increase of the thermoelectric power factor SP The authors [7,8] offer to determine a theoretical oscillation period value (ΔdB theor B ) for nanostructures, based on IV-VI compounds, using a known Fermi energy εB F B of single crystals. In our opinion, for nanostructures Fermi level is largely dependent on their topology and size, which, in turn, are determined by technological factors of growth.…”

Section: Discussionsupporting

confidence: 70%

“…Naturally, we assumed that this behavior is due to size effects in quantum well formed by the potential barrier on the edge of polyamide substrate and oxidative layer on the condensate surface (similar to the results of [7][8][9][10]). …”

Section: Discussionmentioning

confidence: 92%

“…For example, in the study of thickness (d) dependences of thermoelectric parameters for PbSe in quantum well structure KCl/PbSe/EuS [7] experimental data show clearly non-monotonous, oscillation character curves, what indicates the presence of size quantization. The authors [8] examined samples of n-type KCl/PbS/EuS.…”

Section: Introductionmentioning

confidence: 99%

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Size effects in p-PbTe nanostructures on polyamide

Freik¹,

Lysiuk²

2011

Semicond. Phys. Quantum Electron. Optoelectron.

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Section: Discussionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 92%

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Size effects in p-PbTe nanostructures on polyamide

Freik¹,

Lysiuk²

2011

Semicond. Phys. Quantum Electron. Optoelectron.

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“…Earlier we reported oscillatory dependence of the transport properties on the layer thickness d in n-PbTe, n-PbSe, and n-PbS epitaxial thin films (see, for example, [17][18][19][20][21], and we attributed this oscillatory behavior to QSEs due to electron confinement in the IV-VI QWs. It is also of great interest to conduct similar studies for lead chalcogenides with p-type conductivity.…”

Section: Introductionmentioning

confidence: 90%

Oscillatory Behavior of Thermoelectric Properties in p-PbTe Quantum Wells

Рогачева

Водорез

Nashchekina

et al. 2009

Journal of Elec Materi

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The room-temperature dependences of the Seebeck coefficient, Hall coefficient, electrical conductivity, charge carrier mobility, and thermoelectric power factor were obtained as a function of thickness d (d = 8 nm to 400 nm) of PbTe epitaxial layers grown by thermal evaporation in vacuum of PbTe polycrystals doped with Na onto (100)KCl surfaces and covered with an Al 2 O 3 layer. Distinct oscillations in the d-dependences of the properties were observed and attributed to the size quantization of the energy spectra in PbTe layers. The experimental values of the oscillation period are in good agreement with the results of theoretical calculations using the effective-mass approximation and a model for a rectangular potential well with infinitely high walls. It follows from the obtained results that quantization of the energy spectrum in PbTe thin-film structures occurs not only for the electron gas but also for the hole gas.

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“…The quantum size effect leads the nanomaterials have very different magnetic, optical, acoustic, thermal, electrical and superconducting properties with conventional materials, such as very high non-linear optics, optical catalysis, high oxidability and reducibility etc. Due to quantum size effect, the galvanomagnetic and thermoelectric properties (electrical conductivity s, the Hall coefficient RH, charge carrier mobility m, and the Seebeck coefficient S) of nano-size PbSe thin film oscillate with the thin film thickness (3-200 nm) (Rogacheva et al, 2002). Silica glasses are doped with CdS and ZnS micro-crystals.…”

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confidence: 99%

Nanocomposites for Photovoltaic Energy Conversion

Zeng¹,

Gan²

2011

Advances in Composite Materials for Medicine and Nanotechnology

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Induction Composite materialsA composite is a multiphase solid material. It is incorporated by two or more individual materials through physical or chemical methods. The performance of different materials to complement each other will produce synergistic effects (Ivanov et al., 2008;Lu et al., 2010). The overall property of composite materials is better than that of each original material to meet different requirements. These properties include mechanical, electrical, thermal, optical, electrochemical, catalytic behaviors etc. For example (Lu et al., 2010), investigating the synergistic effect of carbon nano-fiber (CNF) and carbon nano-paper on the shape recovery of shape memory polymer (SMP) composite shows that the combination of CNF and carbon nano-paper can improve the thermal and electrical conductivities of the SMP composite, which are much better than each of the components. The individual materials in a composite are referred to as two constituent materials. The two constituent materials are matrix and reinforcement. The matrix material is a frame to support the reinforcement material. So the reinforcement material can keep its relative position. The reinforcement is a functional material which can enhance the matrix properties. Composite metal matrix (substrates) includes aluminum, copper, titanium, magnesium and its alloys and nonmetallic matrix includes synthesized resin, rubber, ceramics, graphite and carbon and so on. Reinforcement mainly includes glass fiber, carbon fiber, boron fiber , aramid fiber, silicon carbide fiber , asbestos fiber, whisker, metal wire and fine grain etc. In order to make use of synergistic effect to improve composite properties, optimum combination of matrix and reinforcement should be chosen. Nanocomposites and their propertiesA nanocomposite is a special composite where one of the phases has one, two or three dimensions less than 100 nanometers (nm, 10 -9 m). A nanocomposite also includes the material where the structures between the different phases that make up the material are in nano-scale (Beecroft & Ober, 1997). In the broadest sense, nanocomposites can also include porous media, colloids, gels and polymers, because in these materials the particles or structures are in nano scale. One nanometer is equivalent to the length to tightly line up www.intechopen.com Advances in Composite Materials for Medicine and Nanotechnology 212 10~100 atoms. Nano-materials include nano-powders, nano-fibers, nano-particles and nanothin films. Their structures are between atom (molecular) size and macro size. Materials in nano-scale have special effects such as quantum size effect, surface effect, small-size effect and macroscopic quantum tunneling effect etc. Quantum size effectQuantum size effect is one of the fundamental physical properties of nano-particles. When the particle size decreases to a nano-scale, the electronic energy levels of the particle atom become discrete and the energy gap becomes wider. This phenomenon is called quantum size effect. This effect does not come into ...

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Quantum size effects in PbSe quantum wells

Cited by 72 publications

References 35 publications

Size effects in p-PbTe nanostructures on polyamide

Size effects in p-PbTe nanostructures on polyamide

Oscillatory Behavior of Thermoelectric Properties in p-PbTe Quantum Wells

Nanocomposites for Photovoltaic Energy Conversion

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