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240415s2019 xx |||||o 00| ||eng c |
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|a 10.1021/acs.chemmater.9b00888
|2 doi
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|a pubmed25n1236.xml
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|a (DE-627)NLM371075130
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|a (NLM)38618186
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|a DE-627
|b ger
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|a eng
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| 100 |
1 |
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|a Persson, Nils E
|e verfasserin
|4 aut
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|a In Situ Observation of Alignment Templating by Seed Crystals in Highly Anisotropic Polymer Transistors
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|c 2019
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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| 338 |
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Revised 25.04.2024
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Due to the highly directional nature of transport in polymer-based organic field-effect transistors (OFETs), alignment of the polymer backbone can significantly affect device performance. While many methods of alignment have been detailed, the mechanism of alignment is rarely revealed-especially in cases of flow-induced alignment. Polymer aggregates are often observed in highly aligned systems, but their role is similarly unclear. Here, we present a comprehensive characterization of blade-coated P(NDI2OD-T2) (N2200) for OFET applications, including a rigorous, multimodal characterization of its in-plane alignment. Film thickness follows the expected power-law dependence on coating speed, while bulk polymer backbone orientation transitions from perpendicular to parallel to the coating direction as speed is increased. Charge carrier mobility >2 cm2/(V s) is achieved parallel to the coating direction for aligned N2200 coated at 5 mm/s and is found to be strongly correlated with the in-plane alignment of the fibrillar morphology at the film's surface, characterized with atomic force microscopy and near-edge X-ray absorption. We develop a model of N2200 crystal anisotropy through rotational scans of grazing incidence wide-angle X-ray scattering (GIWAXS) and use it to analyze simultaneous in situ GIWAXS and UV-vis reflectance data from polymer solutions coated at 5 mm/s. A small population of crystals align early in the drying process, but bulk alignment occurs very late in the drying process, likely mediated by a lyotropic liquid crystal phase transition templated by the aligned crystals. Our characterization also suggests that the majority of material in N2200 thin films is noncrystalline at these conditions
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|a Journal Article
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1 |
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|a Engmann, Sebastian
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Richter, Lee J
|e verfasserin
|4 aut
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| 700 |
1 |
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|a DeLongchamp, Dean M
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Chemistry of materials : a publication of the American Chemical Society
|d 1998
|g 31(2019), 11 vom: 01.
|w (DE-627)NLM098194763
|x 0897-4756
|7 nnas
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| 773 |
1 |
8 |
|g volume:31
|g year:2019
|g number:11
|g day:01
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|u http://dx.doi.org/10.1021/acs.chemmater.9b00888
|3 Volltext
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|a GBV_ILN_11
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|a GBV_ILN_350
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|a AR
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| 952 |
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|d 31
|j 2019
|e 11
|b 01
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