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Анализ причин аномального повышения емкости пленок фуллерита С60 на низких частотах

The anomalous rise of capacitance of C60 fullerite films at low frequencies: a cause analysis
Authors: Dolzhenko, Dmitry; Zakharova, Irina; Sudar, Nicolay;

Анализ причин аномального повышения емкости пленок фуллерита С60 на низких частотах

Abstract

Известный экспериментальный факт аномального возрастания диэлектрической проницаемости ε пленок фуллерита C60 на низких частотах (ниже 1 кГц) переменного электрического тока не имеет до настоящего времени убедительного объяснения. Данное исследование было нацелено на выяснение причин указанной аномалии. Была изготовлена структура p-Si/C60/эвтектика InGa и измерена частотная зависимость ее емкости. На основании полученных экспериментальных данных проведен многосторонний анализ явления. Показано, что возможной причиной аномального повышения ε в низкочастотной области является интеркаляция фуллерита молекулами кислорода с образованием молекулярных групп C60/О2, обладающих значительным дипольным моментом. Наличие таких групп вызывает кардинальное различие между значениями диэлектрической проницаемости поверхностных областей кристаллитов и таковой для области их объема, что, в свою очередь, приводит к кажущемуся подъему диэлектрической проницаемости исследуемой структуры.

A known physical fact of the anomalous rise of dielectric permittivity ε of C60 fullerite films at ac low frequencies (below 1 kHz) has not had a convincing explanation up to now. Our study was aimed at elucidating the causes of that anomaly. The p-Si/C60/InGa-eutectic structure was made and a frequency dependence of its capacitance was measured. Relying on the experimental result, a versatile analysis of the phenomenon was carried out. It was shown that the anomalous rise of ε value in the low-frequency region resulted from oxygen intercalation of fullerite with formation of C60/O2 molecular groups exhibited significant dipole momenta. The presence of such groups produced a dramatic difference between dielectric permittivity of the crystallites’ surface areas and that of their volumes. As a result, the difference led to an apparent increase in the dielectric permittivity ε of the structure under study.

Related Organizations
Keywords

C60 fullerite, oxygen intercalation, фуллерит С60, уравнение Фрёлиха, Frohlich’s equation, диэлектрическая проницаемость, polycrystalline film, поликристаллическая пленка, интеркаляция кислорода, permittivity

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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