Effect of non-isothermal recrystallization on microstructure and transport in poly(thieno-thiophene) thin films

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We present the effect of recrystallization rate on the microstructure and charge transport properties of high-performance semiconducting polymer, poly(2,5-bis(3-alkylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT), thin films. Differential scanning calorimetry (DSC) measurements indicate that the cooling rate directly influences the recrystallization process. In addition, atomic force microscopy (AFM) studies with an X-ray diffraction diagram demonstrate that slow cooling leads to well-connected large domains with enhanced three-dimensionally ordered structures, whereas fast cooling results in misaligned small domains with rough surfaces. At various temperatures, transport characteristics show an increase in the charge carrier mobility and a reduction in the activation energy with decreasing cooling rate of the films. Cooling rates slower than 15 degrees C/min induce the saturation of mobility and activation energy. These results assert that the cooling rate is a crucial factor for ordering in a microstructure as well as for the high performance of polymer thin films. (C) 2011 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2011-10
Language
English
Article Type
Article
Keywords

FIELD-EFFECT MOBILITY; X-RAY-SCATTERING; CHARGE-TRANSPORT; REGIOREGULAR POLY(3-HEXYLTHIOPHENE); SEMICONDUCTING POLYMERS; CONJUGATED POLYMERS; EFFECT TRANSISTORS; MOLECULAR-WEIGHT; CARRIER MOBILITY; POLYTHIOPHENE

Citation

ORGANIC ELECTRONICS, v.12, no.10, pp.1649 - 1656

ISSN
1566-1199
URI
http://hdl.handle.net/10203/95797
Appears in Collection
PH-Journal Papers(저널논문)
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