Fig. 7: Microstructures and local structure analysis for high-performance LISS sample. | Nature Communications

Fig. 7: Microstructures and local structure analysis for high-performance LISS sample.

From: Multiple valence bands convergence and strong phonon scattering lead to high thermoelectric performance in p-type PbSe

Fig. 7

a Low magnification of bright-field TEM image for Pb0.98Na0.02Se−2.05% AgInSe2 sample. b The enlarged TEM pattern presents the nanoscale precipitates remarked by the arrows. c High resolution TEM (HRTEM) picture of a selected nanoprecipitate. d The corresponding selected area electron diffraction (SAED) pattern with cubic structure along [111]. e, f High angle annular dark field (HAADF) patterns for Pb0.98Na0.02Se−2.05% AgInSe2. g Experimental XANES spectra of In K-edge for Pb0.98Na0.02Se−2% AgInSe2 (red dots), and AgInSe2 (orange line), respectively. The blue line shows the theoretical XANES spectrum of In K-edge for In-doped PbSe assuming that In occupies the Pb site. The black line represents a linear combination fitting (LCF) result of In K-edge of Pb0.98Na0.02Se−2% AgInSe2 considering that the In K-edge of AgInSe2 and In-doped PbSe serves as standards. h Multiple scattering calculations of In K-edge XANES for In-doped PbSe with different atomic clusters. The inset shows the nearest-two shell of In atom when it occupies the Pb site in PbSe matrix. The E0 is the absorption edge energy of In K-edge of In foil.

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