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Tailoring the microstructure and charge transport in conjugated polymers by alkyl side-chain engineeringстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 30 марта 2016 г.
- Авторы: Fall Sadiara, Biniek Laure, Odarchenko Yaroslav I., Anokhin Denis V., de Tournadre Grégoire, Lévêque Patrick, Leclerc Nicolas, Ivanov Dimitri, Simonetti Olivier, Giraudet Louis
- Журнал: Journal of Materials Chemistry С
- Том: 4
- Год издания: 2016
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- Первая страница: 286
- Последняя страница: 294
- DOI: 10.1039/c5tc03000e
- Аннотация: Charge transport in conjugated polymers is critical to most optoelectronic devices and depends strongly on polymer structure and conformation in the solid state. Understanding the correlations between charge carrier mobilty, energy disorder and molecular assembly is therefore essential to improve device performances. Alkyl side-chains contribute to intermolecular interactions and are key towards a control of the polymer microstructure and electronic properties. Investigating a set of polymers with common conjugated units but different side-chains functionalization allows new insights into the complex structure-transport relationship. Here, field-effect transistors and space-charge-limited current devices are used together with in-situ grazing-incidence wide-angle X-ray scattering to study charge transport and morphology in a series of donor-acceptor copolymers. Probing hole mobility as a function of carrier density and orientation permits to assess energy disorder and hopping rate anisostropy, while X-ray diffraction allows to link transport properties to polymer microstructure. We show that branched side-chains enhance structural and energy disorder and lead to isotropic transport, whereas linear chains induce either a common lamellar structure or a more exceptional pseudo-hexagonal columnar phase with a helicoidal polymer conformation. The latter enhances out-of-plane mobility but increases energy disorder possibly due to larger interring torsion angles.
- Добавил в систему: Анохин Денис Валентинович