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The impact of molecular weight, air exposure and molecular doping on the charge transport properties and electronic defects in dithienyl-diketopyrrolopyrrole-thieno[3,2-b]thiophene copolymersстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: RiccardoDi Pietro, Tim Erdmann, Naixiang Wang, Xuhai Lu, David Gräfe, Johannes Lenz, Josef Brandt, Daniel Kasemann, Karl Leo, Mahmoud Al-Hussein, Gerasimov Kirill L., David Doblas, Dmitry Anatolyevich Ivanov, Brigitte Voit, Dieter Neher, Anton Kiriy
- Журнал: Journal of Materials Chemistry С
- Год издания: 2016
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- DOI: 10.1039/C6TC03545K
- Аннотация: We performed an in depth study of high molecular weight poly[3,6-dithiophene-2- yl)-2,5- di(2-octyldodecyl)- pyrrolo[3,4-c]pyrrole-1,4- dione-alt-thieno[3,2-b]thiophene] P(DPP2OD-TT) synthesized through Stille coupling polycondensation in order to understand the correlation between molecular weight, processing conditions and charge transport. We observe a rapid increase in aggregation in solution with increasing molecular weight which strongly limits solubility and processability for weight average molecular weights beyond 200 kg.mol-1. This results in severe limitation in the charge transport properties of the polymer. We further observe the presence of bulk electronic defects in all different polymer batches that severely limit current flow and manifest themselves in organic field effect transistors as an apparent charge density dependence of the mobility. These defects are passivated by exposure to ambient atmosphere, as confirmed by an increase in current and a mobility that is no more charge density dependent. This is further confirmed by the result of chemical doping using 2,2-(perfluoronaphthalene- 2,6-diylidene)dimalononitrile, F6TCNNQ, which leads to a filling of the trap states and a higher charge density independent mobility of up to 1 cm 2 V-1.s-1.
- Добавил в систему: Иванов Дмитрий Анатольевич