Electrical Properties of Polymers Doped with Charge Transfer Complexes Forming Additives

Ulański, Jacek; Jeszka, J.K.; Κryszewski, M.

doi:10.1080/03602558108067704

Cited by 13 publications

(2 citation statements)

References 96 publications

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“…However, doping and photoexcitation can have different effects on the asymmetry in differential conductivity through entropy in internal energy of charge carriers in organic semiconductor. Specifically, doping can increase the electrical conductivity but also forms the charge-transfer complexes between polymer chains and dopant molecules in an organic semiconducting material. − It should be noted that doping-induced charge-transfer complexes can largely facilitate interchain thermal transport and consequently increase thermal conductivity with the consequence of decreasing the asymmetry in differential conductivity. This can reduce the entropy difference in internal energy of charge carriers in developing Seebeck effect between high- and low-temperature surfaces.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Seebeck Effects by Using Excited States in Organic Semiconducting Polymer MEH-PPV Based on Multilayer Electrode/Polymer/Electrode Thin-Film Structure

Liu

Garrett

et al. 2013

J. Phys. Chem. C

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This article reports the experimental studies on using photoexcitation-generated excited states as a new approach to increase Seebeck coefficient as well as electrical conductivity in an organic semiconducting polymer MEH-PPV (poly(2-methoxy-5-(2′-ethylhexyloxy)-p-phenylene vinylene) with multilayer electrode/polymer/electrode thin-film architecture. Our experimental results show that a photoexcitation can lead to a large Seebeck coefficient of 305 μV/K in the ITO/MEH-PPV/Au device under the light intensity of 16 mW/cm2. Simultaneously, the electrical conductivity is increased to 8.2 × 10–5 S/cm from the dark conductivity of 3.6 × 10–6 S/cm. Clearly, using excited states can lead to a simultaneous increase on Seebeck coefficient and electrical conductivity, as compared to opposite phenomenon induced by doping: increasing electrical conductivity but decreasing Seebeck coefficient. Our experimental studies suggest that excited states can increase both the entropy difference between high and low-temperature surfaces through electron–phonon coupling and the charge density through dissociation to simultaneously enhance Seebeck coefficient and electrical conductivity in the ITO/MEH-PPV/Au device. The underlying mechanism can be attributed to the fact that excited states can largely affect the dominating electrical-transporting factor, namely, interchain electrical transport, but negligibly changes the dominating thermal-transporting factor, namely, interchain thermal transport in an organic semiconducting polymer. As a result, using photogenerated excited states presents a promising approach to develop high Seebeck effects in organic semiconducting materials based on multilayer electrode/polymer/electrode thin-film design.

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Section: Introductionmentioning

confidence: 99%

Enhancing Seebeck Effects by Using Excited States in Organic Semiconducting Polymer MEH-PPV Based on Multilayer Electrode/Polymer/Electrode Thin-Film Structure

Liu

Garrett

et al. 2013

J. Phys. Chem. C

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“…Thus the polymeric properties (e.g., mechanical properties) of the system were preserved. 2 The proper conditions elaborated for the preparation of conducting polymer films consisting of PC and TTT-TCNQ were insufficient for systems with the best-known conducting CT complex: tetratiofulvalene (TTF)-TCNQ. This is probably due to the different solubility and crystallization ability of TTF-TCNQ compared with TTT-TCNQ complex.…”

mentioning

confidence: 99%

Conditions for Reticulated Crystalline Doping of Polymer with Charge Transfer Complexes

Tracz

Ulański

Κryszewski

1983

Polym J

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Crystallization of the conductive charge transfer (CT) complex forming a reticulated, dendritic morphology within a polymeric matrix during film casting is a new way for obtaining conductive polymers. Subject to proper crystallization conditions during film casting one can obtain materials with high conductivity at a concentration of additives as low as I wt%. This paper describes a model concept allowing for the selection of proper crystallization conditions leading to suitable morphology of crystalline additives. It is based on an analysis of morphologies from evaporating solutions containing polymer and low molecular weight CT complexes-forming additives. Considerations are based on the results obtained for TTF-TCNQ CT complexes crystallized in polycarbonate and polystyrene matrices.

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Polymers, Electrical and Electronic Properties

Ulański

Κryszewski

2003

Digital Encyclopedia of Applied Physics

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Electrical Properties of Polymers Doped with Charge Transfer Complexes Forming Additives

Cited by 13 publications

References 96 publications

Enhancing Seebeck Effects by Using Excited States in Organic Semiconducting Polymer MEH-PPV Based on Multilayer Electrode/Polymer/Electrode Thin-Film Structure

Enhancing Seebeck Effects by Using Excited States in Organic Semiconducting Polymer MEH-PPV Based on Multilayer Electrode/Polymer/Electrode Thin-Film Structure

Conditions for Reticulated Crystalline Doping of Polymer with Charge Transfer Complexes

Polymers, Electrical and Electronic Properties

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