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Lattice dynamics and substrate-dependent transport properties of (In, Yb)-doped CoSb3 skutterudite thin films
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Image of FIG. 1.
FIG. 1.

(Color online) GIXRD patterns of the films. The XRD pattern of the target is also shown for comparison.

Image of FIG. 2.
FIG. 2.

(Color online) Raman spectra of (In, Yb)-doped CoSb3 film. The experimental data is shown by open circles and the overall fit by the solid black line. The individual Lorentzian line shapes are shown by the respective dashed lines. The identified phonon modes are marked.

Image of FIG. 3.
FIG. 3.

(Color online) Temperature variation of electrical resistivity of the films. The high-temperature resistivity measured using the linear four-probe technique is shown enlarged in the inset.

Image of FIG. 4.
FIG. 4.

(Color online) ln (ρ) vs 1/T plot for the films. The linear fits to the high-temperature region above 250 K are also shown.

Image of FIG. 5.
FIG. 5.

(Color online) Carrier concentration of the films as a function of inverse temperature. Inset shows the calculated Hall mobility of the films as a function of temperature along with a T 3/2 fit (dotted line).

Image of FIG. 6.
FIG. 6.

(Color online) Measured high-temperature Seebeck coefficient of the films.

Image of FIG. 7.
FIG. 7.

(Color online) Calculated power factor of the films as a function of temperature.

Image of FIG. 8.
FIG. 8.

(Color online) Co and O core-loss signal along the EELS line scan done perpendicular to the interface for the films. The x axis shows the length of the line scans in nm from which the interface region can be quantified. The interface region is marked by the vertical lines. To the left of the interface is the film and to the right, the substrate.


Generic image for table
Table I.

Peak positions, ν and linewidths (FWHM), Δν (in cm−1) from Lorentzian fits to the Raman active modes for the In0.1Yb0.1Co4Sb12 film together with that reported for unfilled CoSb3 crystallite,30 the theoretically predicted zone center frequencies,11 and the associated assignment of modes.

Generic image for table
Table II.

Calculated transport properties at 300 K of the films and that reported for the target.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Lattice dynamics and substrate-dependent transport properties of (In, Yb)-doped CoSb3 skutterudite thin films