期刊
JOURNAL OF APPLIED PHYSICS
卷 114, 期 19, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4828882
关键词
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资金
- Air Force office of Scientific Research (AFOSR) MURI program [FA9550-08-0340]
- Center for Solar and Thermal Energy Conversion
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0000957]
- National Science Foundation (NSF) Materials World Network [0806867]
- Direct For Mathematical & Physical Scien [0806867] Funding Source: National Science Foundation
- Division Of Materials Research [0806867] Funding Source: National Science Foundation
In organic semiconductors, the Wiedemann-Franz law is often violated, potentially enabling independent control over electrical and thermal conductivities, as observed here with the organic-metal nanocomposites. This effect is attributed to the interface between metal particles and organic matrix materials impeding thermal transport. Thermal conductivity (k(th)) can be decoupled from electrical conductivity (sigma(e)) in the composite of an archetypal organic semiconductor (Copper Phthalocyanine, CuPc) and silver, with thermal boundary conductance as low as 13 MW/m(2)K at the interface. We show that k(th) decreases with volume fraction occupied by silver nanoparticles (x(Ag)%) in the dilute limit, reaching a minimum value at a concentration x(Ag)%(min) = 18%, while sigma(e) exceeds that of the pure organic semiconductor. Further modeling indicates that ZT values of organic-inorganic nanocomposites can be potentially enhanced 10 fold around x(f)%(min), compared to ZT of the pure compounds. These findings suggest a novel pathway for the future design of organic thermoelectric materials. (C) 2013 AIP Publishing LLC.
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