The thermoelectric power of a semiconductor p-n heterojunction

Gadzhialiev, M. M.; Pirmagomedov, Z. Sh.

doi:10.1134/1.1626211

Cited by 3 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Nowadays, the thermoelectric properties of many materials are intensively studied. The objects of researches are metals, alloys, semiconductors [1,2], fullerenes [3], composites [4], including biomorphic ones [5], etc. A promising thermoelectric material is graphene [6].…”

Section: Introductionmentioning

confidence: 99%

Power Factor for Layered Thermoelectric Materials with a Closed Fermi Surface in a Quantizing Magnetic Field

Gorskyi

2013

Ukr. J. Phys.

View full text Add to dashboard Cite

The field dependence of the power factor for a layered thermoelectric material with a closed Fermi surface in a quantizing magnetic field and at helium temperatures has been studied in the geometry where the temperature gradient and the magnetic field are perpendicular to the material layers. The calculations are carried out in the constant relaxation time approximation. In weak magnetic fields, the layered-structure effects are shown to manifest themselves in a phase retardation of power factor oscillations, increase of their relative contribution, and certain reduction of the power factor in whole. In high magnetic fields, there exists an optimal range, where the power factor reaches its maximum, with the corresponding value calculated for the chosen parameters of the problem in the effective mass approximation being by 12% higher than that for real layered crystals. Despite low temperatures, the power factor maximum obtained with those parameters in a magnetic field of 1 T has a value characteristic of cuprate thermoelectric materials at 1000 K. For this phenomenon to take place, it is necessary that the ratio between the free path of charge carriers and the interlayer distance should be equal to or larger than 30,000. However, in ultraquantum magnetic fields, the power factor drastically decreases following the dependence P ∝ T −3 B −6 . The main reason for this reduction is a squeeze of the Fermi surface along the magnetic field in the ultraquantum limit owing to the condensation of charge carriers on the bottom of a single filled Landau subband. K e y w o r d s: power factor, thermoelectric coefficient, quantizing magnetic field, Landau's subband, Fermi surface squeeze.

show abstract

Section: Introductionmentioning

confidence: 99%

Power Factor for Layered Thermoelectric Materials with a Closed Fermi Surface in a Quantizing Magnetic Field

Gorskyi

2013

Ukr. J. Phys.

View full text Add to dashboard Cite

show abstract

“…At the present time much attention is given to the development and study of the properties of new thermoelectric materials. The objects of experimental investigation are metals, alloys, semiconductors [1,2], fullerenes [3], composites [4], including biomorphic [5], etc.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal conductivity of layered charge-ordered crystals in a high quantizing magnetic field

Gorskyi

2011

Semiconductors

View full text Add to dashboard Cite

The longitudinal Seebeck coefficient of the charge-ordered layered crystals in a strong quantizing magnetic field normal to layers plane has been determined.The conditions whereby charge ordering parameter and chemical potential of charge carriers are the oscillating functions of the magnetic field induction are considered. The longitudinal Seebeck coefficient has been calculated for two models of the relaxation time: i) constant relaxation time and ii) the relaxation time proportional to the longitudinal velocity. It has been shown that in a quasi-classical region of magnetic fields for the case of the relaxation time proportional to the longitudinal velocity the longitudinal Seebeck coefficient is less than for the case of constant relaxation time. In this region, for selected problem parameters it does not exceed 4.37μV/K. In the strong quantizing magnetic fields for both models of the relaxation time the longitudinal Seebeck coefficient is virtually the same. For selected problem parameters its maximal modulus is 2033μV/K. At the same time, in the disordered layered crystals, in a quasiclassical region, the Seebeck coefficient is approximately one order of magnitude less than for the charge ordered crystals. In the strong magnetic fields, the Seebeck coefficient for the disordered layered crystals is factor of 7 to 9 less than for the charge-ordered crystals. However, in super strong magnetic fields, under current carriers concentration in the only filled Landau sub-band, for both models of the relaxation time the modulus of the Seebeck coefficient tends to zero according to asymptotic law 2   B zz  . IntroductionAt the present time much attention is given to the development and study of the properties of new thermoelectric materials. The objects of experimental investigation are metals, alloys, semiconductors [1, 2], fullerenes [3], composites [4], including biomorphic [5], etc.Theory of thermoelectric properties of materials, including nanosystems, is being actively developed as well [6,7]. One of the first works on the theory of transverse Seebeck coefficients of metals in quantizing magnetic fields was performed by Kosevich and Andreyev [8].Many of the investigated materials, for instance, semiconductor systems of A II B VI C VII class, intercalated graphite compounds, synthetic metals, graphene, etc. belong in their crystal structure to layered materials. At the same time, the overwhelming majority of theoretical works dedicated to behaviour of such layered systems in quantizing magnetic fields are mainly concerned with the transverse galvanomagnetic effects. The author of this paper is aware of only one work which deals with the thermal conductivity of graphene in a quantizing magnetic field [9]. In so doing, its Fermi surface is considered to be open, that is, such which occupies the entire one-dimensional Brillouin zone and, with a periodic continuation, is a connected one, that is, represents a continuous corrugated cylinder.

show abstract

Influence of temperature on certain properties of n +-p and n +-p-p + structures based on secondary cast polycrystalline silicon

et al. 2011

View full text Add to dashboard Cite

The thermoelectric power of a semiconductor p-n heterojunction

Cited by 3 publications

References 2 publications

Power Factor for Layered Thermoelectric Materials with a Closed Fermi Surface in a Quantizing Magnetic Field

Power Factor for Layered Thermoelectric Materials with a Closed Fermi Surface in a Quantizing Magnetic Field

Longitudinal conductivity of layered charge-ordered crystals in a high quantizing magnetic field

Influence of temperature on certain properties of n +-p and n +-p-p + structures based on secondary cast polycrystalline silicon

Contact Info

Product

Resources

About