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Resonant carrier scattering by core-shell nanoparticles for thermoelectric power factor enhancement
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Three dimensional schematic of the proposed core-shell nanoparticle structure and (b) potential profile around the nanoparticles in radial direction. The core region (r < a) has heavier effective mass (i.e., 1 to 1.2m0) than those of the shell region and the host material (i.e., 0.053m0, the density of states effective mass of PbTe at 80 K).

Image of FIG. 2.
FIG. 2.

(Color online) Scattering time of 1 × 1018 cm−3 core-shell nanoparticles as a function of electron energy for varying well bottom in the core from V 0 = −0.24 eV to −0.12 eV with a step size of 0.02 eV. Other parameters of the core-shell nanoparticles are all assumed to be constants as V 1 = 0.2 eV, a = 1.5 nm, b = 3 nm,  = 1.2m0, and  = 0.053m0.

Image of FIG. 3.
FIG. 3.

(Color online) Differential scattering cross section in units of πa 2 (cross section of core region) as a function of final electron momentum (polar angle and magnitude) for core-shell nanoparticles with (a) non-resonant scattering and (b) resonant scattering with resonant energy level at ∼0.07 eV. The incident wave propagates to the +x-direction from left to right.

Image of FIG. 4.
FIG. 4.

(Color online) (a) Seebeck coefficient, (b) electrical conductivity, and (c) power factor of PbTe with 1 × 1018 cm−3 core-shell nanoparticles embedded in comparison with bulk PbTe values as a function of carrier density at 80 K. The parameters of the core-shell nanoparticles used in these plots are the same as those used in Fig. 2 with varying well bottom (V 0).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Resonant carrier scattering by core-shell nanoparticles for thermoelectric power factor enhancement