Fig. 2 Characterization of the TED.

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Presentation transcript:

Fig. 2 Characterization of the TED. Characterization of the TED. (A) Measurement of the thermal conductance of the TED (GTED). A GTED value of 32 W m−2 K−1 was determined from the slope of the temperature differences between the cold and hot sides (ΔT) versus the applied heat flux to the underlying heater, when there is no current applied to the TED (i.e., passive mode). (B) Measurement of the device-level Seebeck coefficient (S = 196 μV K−1) by comparing ΔT and corresponding open-circuit voltages (VOC). (C) Thermal conductivity of the polymeric Ecoflex stretchable sheets (kp) for various volume ratios of the Ecoflex and AlN microparticles. The mixture layer containing 26 volume % of AlN microparticles exhibited kp = 0.77 W m−1 K−1, which is four times higher than that of pristine Ecoflex (kp = 0.20 W m−1 K−1). (D) Finite element simulation of cooling/heating effect with the measured TED parameters. More than 7°C maximum cooling was estimated with only natural convection and radiation. (E) Electrical resistance (R) stability for various bending radii (r) from flat to 20 mm, where R0 is R when the TED is flat, and ΔR is the difference between R and R0. (F) Electrical resistance stability over 1000 bending cycles with r = 30 mm. Photo credit: Sahngki Hong, University of California, San Diego. Sahngki Hong et al. Sci Adv 2019;5:eaaw0536 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).