Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 24, Issue 14, Pages 2005-2012Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201302954
Keywords
conjugated polymers; ionic liquid; transport properties; gate dielectric; pressure
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Funding
- Strategic International Collaborative Research Program (SICORP), Japan Science and Technology Agency [21224009, 25000003]
- Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program) from JSPS, Japan
- Grants-in-Aid for Scientific Research [25000003] Funding Source: KAKEN
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An effective way of using ionic liquid as a gate dielectric as well as a pressure medium to tune the transport of an exemplary polymer semiconductor, poly(2,5-bis(3-tetradecyl-thiophene-2-yl)thieno[3,2-b]thiophene) (pBTTT-C14) is presented. Working as gate dielectrics, the ionic liquids exhibit the well-known ability to induce dense carriers (>10(20) cm(-3)) in the polymer film contributing to the high conductivity (approximate to 10(2) S cm(-1)). In addition, it is found that the ionic liquid works as a pressure medium at the highly charged state, leading to significant enhancement of conductivity. By combining both gating and pressuring, a crossover of transport properties is observed from one-dimensional to three-dimensional hopping, as the clear indication that the polymer film has accessed the regime adjacent to the transition region between insulator and metal. These results show an effective way of utilizing pressure effect of ionic liquid as a new degree of freedom in controlling transport of polymers, a method having strong potential to be generalized for even broader range of materials.
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