Schematic drawing of the library holder assembly for Seebeck coefficient mapping instrument, including heaters (a) and (i), copper blocks (b), ceramic pads (c), vertical and horizontal thermocouples (d) and (f), ceramic block (e), brass clamps (g), and a sample library (h). The X- and Y-stages and Z-probe are not shown in the figure.
Correlation between temperatures at front and back sides of the library obtained from measurements at several different controller set points temperatures. The black dotted line represents the perfect agreement of temperatures at both sides of the library. (Inset) Thermal image of the front side of the sample library for the 75 °C set point temperature of the controller. The areas outlined by circles at the locations of the 10 thermocouples indicate the back side temperatures.
Current-voltage curves for 11 different samples that constitute 1 row on a typical Zn–Co–O library.
Color plots of (a) temperature difference and (b) resulting voltage for one of the five measurement configurations. (c) Example result of Seebeck coefficient measurement for a sample on Row 1 (circles), and a sample on Row 2 (squares) of the library that are outlined in (a) and (b). Dashed lines are the best fits to the experimental data.
Comparison of Seebeck coefficients measured on the mapping instrument (“Combi”) with Seebeck coefficients measured on the single-composition measurement instrument (“Reference”). Error bars that are not visible are smaller than the symbols. The dashed line represents perfect agreement.
Color plots of (a) chemical composition and (b) Seebeck coefficient on the Zn–Co–O combinatorial library; (c) Seebeck coefficient as a function of cation fraction of Zn atoms in Zn–Co–O films and Ni atoms in Ni–Co–O films. Vertical dashed line indicates Co2ZnO4 and Co2NiO4 composition.
(a) Seebeck coefficient of Zn–Co–O as a function of measurement temperature and chemical composition. Vertical dashed line indicates Co2ZnO4 composition. (b) Seebeck coefficient at the Co2ZnO4 composition as a function of measurement temperature. Note that in both (a) and (b) the scale for the Seebeck coefficient is the same logarithmic scale used in Fig. 6 .
Summary of the existing approaches to spatially resolved Seebeck coefficient measurements.
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