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An effect of the electrode material on space charge relaxation in ferroelectric copolymers of vinylidene fluorideстатья
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: 16 февраля 2016 г.
- Авторы: Kochervinskii V., Malyshkina I., Pavlov A., Pakuro N., Bessonova N., Shmakova N., Bedin S., Chubunova E., Lebedinskii Yu
- Журнал: Journal of Applied Physics
- Том: 118
- Номер: 24
- Год издания: 2015
- Издательство: AIP Publishing
- Местоположение издательства: United States
- Первая страница: 244102
- DOI: 10.1063/1.4938016
- Аннотация: Processes of relaxation of space charges formed by impurities carriers in isotropic films of vinylidene fluoride and tetrafluoroethylene copolymers of the composition 71/29 and 94/6 were studied. Al and Au symmetric electrodes deposited by evaporation in vacuum have been used. In the case of Al electrodes at temperatures above 100 °C, giant low frequency dielectric dispersion was observed, while it is absent in films with Auelectrodes. Causes of this phenomenon were studied by the X-ray photoelectron spectroscopy. It was shown that at Al deposition, new functional groups, such as Al-C, Al-F, and Al2O3, which are not characteristic of the copolymerfilm surface, formed. They were supposed to be traps for impurity carriers and because of this the electrode became partially blocked. This led to appearance of the giant electrodepolarization on the metal-polymer boundary, which did not take place in the case of Auelectrodes. Parameters of the Au4f line for the copolymer with different contents of fluorine atoms in the chain were analyzed. An increase in the number of these atoms was shown to result in the line shift to higher energies. This phenomenon was associated with an increase in the shift of the electron density from Au atoms to the F ones which has a high affinity to electrons.
- Добавил в систему: Малышкина Инна Александровна