Transmission of electrons with flat passbands in finite superlattices

Barajas-Aguilar, A. H.; Rodríguez-Magdaleno, K.A.; Martı́nez-Orozco, J.C.; Enciso-Muñoz, A; Contreras-Solorio, D. A.

doi:10.1088/1757-899x/45/1/012031

Cited by 2 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the parlance of the figure of merit, such a structure possesses an infinite value of zT , and actually delivers a zero power output. This typically establishes the trade-off between the efficiency and the output power [10,15,16] in nanostructured thermoelectric devices, and also the inadequacy of using the figure of merit as the sole performance descriptor.…”

Section: Introductionmentioning

confidence: 99%

“…In order to reconcile with this issue, it was recently proposed by Whitney [17,18] that a "boxcar" shaped transmission function with a finite spectral width can serve to maximize the efficiency of an irreversible system for a given output power. The boxcar shaped transmission function can in general be achieved by using heterostructure layers, such as a superlattice (SL), in which * bm@ee.iitb.ac.in minibands are formed with a certain bandwidth separated by forbidden bands [15,[19][20][21][22] due to which a favorable density of states (DOS) profile for providing a thermoelectric figure of merit enhancement [23][24][25] results. Furthermore, superlattices can be designed for optimizing electronic transport by controlling the band offsets, quantum confinements and the tunneling processes between the different layers of materials [26].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Superlattice design for optimal thermoelectric generator performance

Priyadarshi¹,

Sharma²,

Mukherjee³

et al. 2018

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

We consider the design of an optimal superlattice thermoelectric generator via the energy bandpass filter approach. Various configurations of superlattice structures are explored to obtain a bandpass transmission spectrum that approaches the ideal "boxcar" form, which is now well known to manifest the largest efficiency at a given output power. Using the non-equilibrium Green's function formalism coupled self-consistently with the Poisson's equation, we identify such an ideal structure and also demonstrate that it is almost immune to the deleterious effect of self-consistent charging and device variability. Analyzing various superlattice designs, we conclude that superlattices with a Gaussian distribution of the barrier thickness offers the best thermoelectric efficiency at maximum power. It is observed that the best operating regime of this device design provides a maximum power in the range of 0.32-0.46 M W/m 2 at efficiencies between 54%-43% of Carnot efficiency. We also analyze our device designs with the conventional figure of merit approach to counter support the results so obtained. We note a high zT el = 6 value in the case of Gaussian distribution of the barrier thickness. With the existing advanced thin-film growth technology, the suggested superlattice structures can be achieved, and such optimized thermoelectric performances can be realized.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Superlattice design for optimal thermoelectric generator performance

Priyadarshi¹,

Sharma²,

Mukherjee³

et al. 2018

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

A New Alternative Method for the Generation of Acoustic Filters, Modulating Acoustic Impedance: Theoretical Model

Madrigal-Melchor¹,

Enciso-Muñoz²,

Contreras-Solorio³

et al. 2017

OJA

View full text Add to dashboard Cite

Using the transfer matrix method we calculate the frequency dependence of the transmission of longitudinal elastic waves for a layered structure where the specific acoustic impedance of the layers with odd numbering follows a Gaussian distribution, while the inserted even layers have the same impedance as the propagation medium. The structure presents intervals of low-pass, bandstop, and band-pass. The characteristics of the bands depend on the number of layers, on the contrast between the maximum and minimum impedances of the structure, and on the ratio of the width of the inserted layers to the width of the layers with a Gaussian distribution of impedances.

show abstract

Transmission of electrons with flat passbands in finite superlattices

Cited by 2 publications

References 3 publications

Superlattice design for optimal thermoelectric generator performance

Superlattice design for optimal thermoelectric generator performance

A New Alternative Method for the Generation of Acoustic Filters, Modulating Acoustic Impedance: Theoretical Model

Contact Info

Product

Resources

About