Thermoelectric properties of semiconducting materials with parabolic and pudding-mold band structures

Adhidewata, Jyesta M.; Nugraha, Ahmad R. T.; Hasdeo, Eddwi H.; Estellé, Patrice; Gunara, Bobby Eka

doi:10.48550/arxiv.2107.06826

Cited by 1 publication

(1 citation statement)

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“…One can tune the bandgap or change the combination of the band structures to know the optimized structure that will give better TE properties. Several works related to the band engineering have been performed for many types of band structures, such as pudding-mold bands [35][36][37][38][39], parabolic bands [40][41][42], and linear Dirac bands [43]. In particular, the existence of a heavy band alongside the Dirac bands gives a high power factor (PF) in a semimetal like CoSi.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectrics properties of two-dimensional materials with combination of linear and nonlinear band structures

Darmawan¹,

Suprayoga²,

Nugraha³

et al. 2022

Preprint

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We investigate thermoelectric (TE) properties of two-dimensional materials possessing two Dirac bands (a Dirac band) and a nonlinear band within the three-(two-)band model using linearized Boltzmann transport theory and relaxation time approximation. In the three-band model, we find that combinations of Dirac bands with a heavy nonlinear band, either a parabolic or a puddingmold band, does not give much difference in their TE performance. The apparent difference only occurs in the position of the nonlinear band that leads to the maximum figure of merit (ZT ). The optimum ZT of the three-band model consisting of a nonlinear band is found when the nonlinear band intersects the Dirac bands near the Fermi level. By removing the linear conduction band, or, in other words, transforming the three-band model to the two-band model, we find better TE performance in the two-band model than in the three-band model, i.e., in terms of higher ZT values.

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