Thermopower enhancement in conducting polymer nanocomposites via carrier energy scattering at the organic-inorganic semiconductor interface

Ming He, Jing Ge, Zhiqun Lin, Xuhui Feng, Xinwe Wang, Hongbin Lu, Yuliang Yang, Feng Qiu

Research output: Contribution to journalArticlepeer-review

369 Scopus citations

Abstract

The energy-filtering effect was successfully employed at the organic-inorganic semiconductor interface of poly(3-hexylthiophene) (P3HT) nanocomposites with the addition of Bi2Te3 nanowires, where low-energy carriers were strongly scattered by the appropriately engineered potential barrier of the P3HT-Bi2Te3 interface. The resulting P3HT-Bi2Te3 nanocomposites exhibited a high power factor of 13.6 μW K-2 m-1 compared to that of 3.9 μW K-2 m-1 in P3HT. The transport characteristics of nanocomposites, including the carrier concentration, mobility, and energy-dependent scattering parameter, were revealed by the experimental measurements of electrical conductivity, Seebeck coefficient, and Hall coefficient to quantitatively elucidate the carrier energy scattering at the P3HT-Bi2Te3 interface. The ability to rationally engineer the organic-inorganic semiconductor interfaces of polymer nanocomposites to achieve an improved Seebeck coefficient and power factor provides a potential route to high-performance, large-area, and flexible polymer thermoelectric materials.

Original languageEnglish
Pages (from-to)8351-8358
Number of pages8
JournalEnergy and Environmental Science
Volume5
Issue number8
DOIs
StatePublished - Aug 2012

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