<i>Electronic Processes in Non-Crystalline Materials</i>

Mott, N. F.; Davis, E. A.; Weiser, K.

doi:10.1063/1.3071145

Cited by 641 publications

(936 citation statements)

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“…The PEDOT:PSS film also exhibits a negative value of R H , which, however, is due to hopping transport of holes in PEDOT:PSS. 34 The negative Hall coefficient in p-type PEDOT:PSS films has already been independently reported. 35 The p-type conductivity of the PEDOT:PSS film on paper will be confirmed by its positive Seebeck coefficient considered below.…”

Section: ■ Results and Discussionmentioning

confidence: 85%

Fine Art of Thermoelectricity

Брус

Gluba

Rappich

et al. 2018

ACS Appl. Mater. Interfaces

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A detailed study of hitherto unknown electrical and thermoelectric properties of graphite pencil traces on paper was carried out by measuring the Hall and Seebeck effects. We show that the combination of pencil-drawn graphite and brush-painted poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) films on regular office paper results in extremely simple, low-cost, and environmentally friendly thermoelectric power generators with promising output characteristics at low-temperature gradients. The working characteristics can be improved even further by incorporating ntype InSe flakes. The combination of pencil-drawn n-InSe:graphite nanocomposites and brush-painted PEDOT:PSS increases the power output by 1 order of magnitude.

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Section: ■ Results and Discussionmentioning

confidence: 85%

Fine Art of Thermoelectricity

Брус

Gluba

Rappich

et al. 2018

ACS Appl. Mater. Interfaces

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“…2 Optical band gaps for direct and indirect transitions have been obtained following Mott and Davis [14], using the equation…”

Section: B Energy Band Gap and Cut-off Wavelengthmentioning

confidence: 99%

Effect of Nd3 + concentration on the physical and absorption properties of sodium-lead-borate glasses

Mohan¹,

Thind²,

Sharma³

2007

Braz. J. Phys.

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The effect of increasing the rare earth ion concentration on the physical and spectroscopic properties of Nd 3+ doped sodium-lead-borate glasses have been studied for the compositions (10-x) Na 2 O-30PbO-60B 2 O 3 -xNd 2 O 3 , where x = 1.00, 1.25, 1.50, 1.75 and 2.00 mol %. Optical band gaps, cut-off wavelengths and various spectroscopic parameters (E 1 , E 2 , E 3 , F 2 , F 4 , F 6 and ξ 4 f ) have been determined from the room temperature absorption spectra. Judd-Ofelt theory has been employed to determine the intensity parameters Ω 2 , Ω 4 and Ω 6 which in turn are used to evaluate radiative transition probability (A), branching ratio (β) and radiative lifetime (τ R ) for the fluorescent level 4 F 3/2 . The Ω 2 parameter and hence the non-symmetric component of electric field acting on Nd 3+ ion is found to be highest for glass with 1.75 mol% of Nd 2 O 3 . Because of the poor resolution of hypersensitive transition, the covalency of the Nd-O bond has been characterized by the relative intensity of 4 I 9/2 → 4 F 7/2 , 4 S 3/2 . The highest covalency has been predicted for glass with 2 mol% Nd 2 O 3 . The radiative properties are found to improve with an increase in concentration of Nd 2 O 3 for the present study.

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“…Mott assumed that the density of states is constant as a function of energy (i.e., g(E) ) g 0 ) and showed that in that case R(∆E) ) 3/4(4/3πg 0 ∆E) -1/3 . 22 Later Efros and Shklovskii showed that when Coulomb interactions between different hopping sites are important, g(E) is depleted near the Fermi level. This effect is called the Coulomb gap; it changes item (ii) to R(∆E) ) e 2 (4πεε 0 ∆E) -1 .…”

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confidence: 99%

“…In the case of Mott-VRH, this yields a hopping rate given by ln Γ ∝ T -1/4 , which results in a conductivity σ with the same T dependence. 22 The Coulomb gap in the EfrosShklovskii model results in a different T dependence of the form ln σ ∝ T -1/2 . 23 The temperature-dependent electronic conductivity in disordered atomic solids has been studied extensively.…”

mentioning

confidence: 99%

Reappraisal of Variable-Range Hopping in Quantum-Dot Solids

2008

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The temperature dependence of the electrical conductivity of assemblies of ZnO nanocrystals, studied with an electrochemically gated transistor is very accurately described by the relation ln σ ) ln σ 0 -(T 0 /T) x with x ) 2/3 over the entire temperature range from 7 to 200 K, independent of charge concentration and dielectric environment. These results cannot be explained by existing models but are supported by results on Au nanocrystals where an identical temperature dependence was observed (Zabet-Khosousi et al., Phys. Rev. Lett. 2006, 96 (15), 156403). We propose an adaptation of the Efros-Shklovskii variable-range hopping model by introducing an expression for nonresonant tunneling based on local energy fluctuations, which yields exactly the temperature dependence that is observed experimentally.

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Electronic Processes in Non-Crystalline Materials

Cited by 641 publications

References 0 publications

Fine Art of Thermoelectricity

Fine Art of Thermoelectricity

Effect of Nd3 + concentration on the physical and absorption properties of sodium-lead-borate glasses

Reappraisal of Variable-Range Hopping in Quantum-Dot Solids

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