Thermoelectric power generation using large-area Si/SiGe pn-junctions with varying Ge content

Wagner, Martin; Span, G.

doi:10.1088/0268-1242/22/1/s41

Cited by 39 publications

(24 citation statements)

References 11 publications

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“…The calculated diffusion coefficients are plotted versus inverse temperature in Figure 7. The preexponential and activation energies of the diffusion coefficients are obtained by fits to equation (3).…”

Section: The Lattice Diffusion Coefficients Were Extracted From Regiomentioning

confidence: 99%

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Chemical tracer diffusion of Sr and Co in polycrystalline Ca-deficient CaMnO_3−δwith CaMn₂O₄precipitates

Desissa

Kanas

Singh

et al. 2018

Phys. Chem. Chem. Phys.

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Diffusivity on the A- and B-site of polycrystalline perovskite CaMnO with Ca deficiency and spinel CaMnO (marokite) as a secondary phase was studied using chemical tracers and secondary ion mass spectrometry (SIMS) complemented by electron probe microanalysis (EPMA). Thin films containing Sr and Co chemical tracers were deposited on the polished surface of the polycrystalline composite sample followed by annealing at 800-1200 °C for 96 h. Diffusion profiles for each tracer were determined with SIMS, followed by calculation of diffusion coefficients by fitting to appropriate models. The Sr tracer showed mainly lattice diffusion, with an activation energy of 210 ± 30 kJ mol, whereas the Co tracer showed a combination of lattice and enhanced grain-boundary diffusion, with activation energies of 270 ± 30 kJ mol and 380 ± 40 kJ mol, respectively. The diffusivities may be used to predict interdiffusion and lifetime of junctions between n-type CaMnO or CaMnO/CaMnO composites and metallization interlayers or p-type leg materials in oxide thermoelectrics. In particular, the relatively high effective diffusivity of Co in polycrystalline CaMnO may play a role in the reported fast formation of the secondary phase (CaCoMnO) between p-type CaCoO and n-type CaMnO in a direct p-n thermoelectric junction.

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Section: The Lattice Diffusion Coefficients Were Extracted From Regiomentioning

confidence: 99%

“…Since a few years, there has been an interest in developing wide-area direct p-n junction-based thermoelectric modules 3 . Similarly, we propose direct p-n junctions between oxide thermoelectric materials to develop high-temperature TEGs without the use of metallic interconnects.…”

Section: Introductionmentioning

confidence: 99%

Chemical tracer diffusion of Sr and Co in polycrystalline Ca-deficient CaMnO_3−δwith CaMn₂O₄precipitates

Desissa

Kanas

Singh

et al. 2018

Phys. Chem. Chem. Phys.

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“…(1)]. Similar structures were proposed for thermoelectric power generation, 17 but the formation of internal currents and their effect on the thermopower and thermal conductivity were not explored. We calculated the distribution of electric potential and quasi-Fermi energy by solving the coupled Poisson and electric current continuity equations in 2D.…”

Section: Simulation Detailsmentioning

confidence: 99%

Electrothermally driven current vortices in inhomogeneous bipolar semiconductors

Levander

Zhang

et al. 2011

Phys. Rev. B

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We report an effect that occurs in semiconductors where internal electrical fields interact with a temperature gradient. Steady current vortices and a magnetic field develop in the system, even without external carrier injection. The effect is electrodynamic, energy dissipative, and fundamentally distinct from any previously described electrothermal effects. In bipolar structures the effective thermopower can be significantly modified by the vortices. Joule heating arising from the vortices reduces the thermal conductivity by an amount comparable to the electronic thermal conductivity.

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“…In large area applications we can, on one side, increase the temperature difference and, on the other, to increase the total supplied power by building a large area single module. One example of large area application can be found in the module proposed by Wagner et al [9] using SiGe alloys, but here the Ge amount used in the module increases the cost of the device and it cannot be developed in practice. We have also developed a module for large area applications based on a p-type conducting polymer [10].…”

Section: Introductionmentioning

confidence: 99%

Review on Polymers for Thermoelectric Applications

2014

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In this review, we report the state-of-the-art of polymers in thermoelectricity. Classically, a number of inorganic compounds have been considered as the best thermoelectric materials. Since the prediction of the improvement of the figure of merit by means of electronic confinement in 1993, it has been improved by a factor of 3–4. In the mean time, organic materials, in particular intrinsically conducting polymers, had been considered as competitors of classical thermoelectrics, since their figure of merit has been improved several orders of magnitude in the last few years. We review here the evolution of the figure of merit or the power factor during the last years, and the best candidates to compete with inorganic materials. We also outline the best polymers to substitute classical thermoelectric materials and the advantages they present in comparison with inorganic systems.

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Thermoelectric power generation using large-area Si/SiGe pn-junctions with varying Ge content

Cited by 39 publications

References 11 publications

Chemical tracer diffusion of Sr and Co in polycrystalline Ca-deficient CaMnO_3−δwith CaMn₂O₄precipitates

Chemical tracer diffusion of Sr and Co in polycrystalline Ca-deficient CaMnO_3−δwith CaMn₂O₄precipitates

Electrothermally driven current vortices in inhomogeneous bipolar semiconductors

Review on Polymers for Thermoelectric Applications

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Thermoelectric power generation using large-area Si/SiGe pn-junctions with varying Ge content

Cited by 39 publications

References 11 publications

Chemical tracer diffusion of Sr and Co in polycrystalline Ca-deficient CaMnO3−δwith CaMn2O4precipitates

Chemical tracer diffusion of Sr and Co in polycrystalline Ca-deficient CaMnO3−δwith CaMn2O4precipitates

Electrothermally driven current vortices in inhomogeneous bipolar semiconductors

Review on Polymers for Thermoelectric Applications

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Chemical tracer diffusion of Sr and Co in polycrystalline Ca-deficient CaMnO_3−δwith CaMn₂O₄precipitates

Chemical tracer diffusion of Sr and Co in polycrystalline Ca-deficient CaMnO_3−δwith CaMn₂O₄precipitates