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Efficient 3D charge transport in planar triazatruxene-based dumbbell-shaped molecules forming a bridged columnar phaseстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 1 декабря 2021 г.
- Авторы: Jiang Jing Thomas Heiser, Heinrich Benoît, Prel Alexis, Steveler Emilie, Han Tianyan, Bulut Ibrahim, Méry Stéphane, Leroy Yann, Leclerc Nicolas, Lévêque Patrick, Rosenthal Martin, Ivanov Dimitri A.
- Журнал: Journal of Materials Chemistry A
- Том: 9
- Год издания: 2021
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- Первая страница: 24315
- DOI: 10.1039/D1TA06300F
- Аннотация: Planar conjugated molecular backbones are essential for achieving high charge carrier mobilities along molecular π-stacking directions but are often concomitant with poor charge transport in other directions. This is particularly the case for molecules that are functionalized with alkyl chains, which ensure good processability in solution but introduce detrimental insulating regions. Here, we show that soluble planar dumbbell-shaped molecules, composed of two triazatruxene (TAT) units covalently bonded to a central thiophene–thienopyrroledione–thiophene (TPD) segment self-assemble into an original structure that allows efficient 3D charge transport. Grazing-incidence wide-angle X-ray scattering investigations as well as micro-focus X-ray experiments on single crystals reveal that the TAT derivatives form a columnar-nematic mesophase in which columns of stacked TAT units spaced by molten chains are interconnected by TPD bridges. Upon annealing, a crystalline phase, stemming from the parent hexagonal mesophase, is obtained with the molecular stacking direction lying in-plane. Transport measurements in the crystalline phase reveal an unusually high out-of-plane hole mobility of 0.17 cm2 V−1 s−1 and a lower limit for the in-plane mobility of 0.05 cm2 V−1 s−1. The results suggest that the TPD segments bridging neighboring stacks of TAT columns are responsible for efficient hole transport in 3D.
- Добавил в систему: Иванов Дмитрий Анатольевич