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(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).
(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.
(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.
(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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