The impact of molecular weight on microstructure andcharge transport in semicrystalline polymersemiconductors–poly(3-hexylthiophene), a model study
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Date
2013
Publication Type
Journal Article
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yes
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Abstract
Electronic properties of organic semiconductors are often critically dependent upon their ability to order from the molecular level to the macro-scale, as is true for many other materials attributes of macromolecular matter such as mechanical characteristics. Therefore, understanding of the molecular assembly process and the resulting solid-state short- and long-range order is critical to further advance the field of organic electronics. Here, we will discuss the structure development as a function of molecular weight in thin films of a model conjugated polymer, poly(3-hexylthiophene) (P3HT), when processed from solution and the melt. While focus is on the microstructural manipulation and characterization, we also treat the influence of molecular arrangement and order on electronic processes such as charge transport and show, based on classical polymer science arguments, how accounting for the structural complexity of polymers can provide a basis for establishing relevant processing/structure/property-interrelationships to explain some of their electronic features. Such relationships can assist with the design of new materials and definition of processing protocols that account for the molecular length, chain rigidity and propensity to order of a given system. © 2013 Elsevier Ltd.
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published
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Journal / series
Progress in polymer science
Volume
38 (12)
Pages / Article No.
1978 - 1989
Publisher
Elsevier
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Subject
Poly(3-hexylthiophene); Molecular weight; Chain-extended crystals; Semicrystalline; Charge transport
Organisational unit
03437 - Smith, Paul (emeritus)
Notes
Received 22 January 2013, Received in revised form 2 July 2013, Accepted 9 July 2013, Available online 31 July 2013.