Effect of host-mobility dependent carrier scattering on thermoelectric power factors of polymer composites
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© 2015 Elsevier Ltd. The interfacial carrier scattering was thought to be ineffective in enhancing thermoelectric (TE) properties of polymer hybrids and there was also a lack of fundamental understanding of carrier scattering at polymer/polymer interfaces. Here we unravel the mechanism behind the role of polymer/polymer interfacial scattering on the TE properties through integration of computation and experiments. We discover that the effect of interfacial scattering at polymer/polymer interfaces on TE properties of polymer hybrids is strongly dependent on the carrier mobility of host polymers besides interfacial barriers. Only when the host carrier mobility is above a threshold, the effect of interfacial scattering on TE enhancement can be significant. Simulation suggests that the host mobility threshold is ~1 cm2V-1s-1 for PEDOT-based polymers. The polymer hybrid system of poly(3,4-ethylenedioxythiophene) (PEDOT) nanowires/PEDOT was successfully employed to verify the theoretical results. These findings offer groundbreaking knowledge on polymer/polymer interfacial carrier-transport and will advance the design and fabrication of high-efficiency organic thermoelectric materials.
author list (cited authors)
Zhang, K., Wang, S., Qiu, J., Blackburn, J. L., Zhang, X., Ferguson, A. J., Miller, E. M., & Weeks, B. L
complete list of authors
Zhang, Kun||Wang, Shiren||Qiu, Jingjing||Blackburn, Jeffrey L||Zhang, Xin||Ferguson, Andrew J||Miller, Elisa M||Weeks, Brandon L