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Characterization of Charge-Carrier Transport in Semicrystalline Polymers: Electronic Coupling, Site Energies, and Charge-Carrier Dynamics in Poly(bithiophene-alt-thienothiophene) [PBTTT]статья
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: 18 декабря 2013 г.
- Авторы: Poelking C., Cho E., Malafeev A., Ivanov V., Kremer K., Risko C., Bredas J.L., Andrienko D.
- Журнал: Journal of Physical Chemistry C
- Том: 117
- Номер: 4
- Год издания: 2013
- Издательство: American Chemical Society
- Местоположение издательства: United States
- Первая страница: 1633
- Последняя страница: 1640
- DOI: 10.1021/jp311160y
- Аннотация: We establish a link between the microscopic ordering and the charge-transport parameters for a highly crystalline polymeric organic semiconductor, poly(2,5-bis(3- tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT). We find that the nematic and dynamic order parameters of the conjugated backbones, as well as their separation, evolve linearly with temperature, while the side-chain dynamic order parameter and backbone paracrystallinity change abruptly upon the (also experimentally observed) melting of the side chains around 400 K. The distribution of site energies follows the behavior of the backbone paracrystallinity and can be treated as static on the time scale of a single-charge transfer reaction. On the contrary, the electronic couplings between adjacent backbones are insensitive to side-chain melting and vary on a much faster time scale. The hole mobility, calculated after time-averaging of the electronic couplings, reproduces well the value measured in a short-channel thin-film transistor. The results underline that to secure efficient charge transport in lamellar arrangements of conjugated polymers: (i) the electronic couplings should present high average values and fast dynamics, and (ii) the energetic disorder (paracrystallinity) should be small.
- Добавил в систему: Иванов Виктор Александрович