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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Rousseva, Sylvia
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (7/7 displayed)
- 2022Investigating the dielectric properties and exciton diffusion in C70 derivativescitations
- 2022Investigating the dielectric properties and exciton diffusion in C 70 derivativescitations
- 2022Organic semiconductors with increased dielectric constants
- 2020Reaching a Double-Digit Dielectric Constant with Fullerene Derivativescitations
- 2020Reaching a Double-Digit Dielectric Constant with Fullerene Derivativescitations
- 2020N-type organic thermoelectrics:demonstration of ZT > 0.3citations
- 2020N-type organic thermoelectricscitations
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article
Reaching a Double-Digit Dielectric Constant with Fullerene Derivatives
Abstract
<p>The dielectric constant (ϵ<sub>r</sub>) of organic semiconductors is a key material parameter for improving device performance in the field of organic electronics. However, the effect of the dielectric constant on the electronic and optoelectronic properties of materials remains unclear due to the scarcity of known organic semiconductors with an ϵ<sub>r</sub> value higher than 6. Herein, the optical and electronic properties of a homologous series of fullerene derivatives with high ϵ<sub>r</sub> are studied. The low frequency (<10<sup>6</sup> Hz) ϵ<sub>r</sub> is extracted from the capacitance measured using impedance spectroscopy, and the effect of length (n) and geometrical arrangement of the polar ethylene glycol (EG) side chains is investigated. The ϵ<sub>r</sub> is found to correlate with length for the symmetrical Bingel adducts, whereas for the unsymmetrical branched-EG chain adducts there is no significant difference between the two EG chain lengths. For BTrEG-2, the ϵ<sub>r</sub> reaches 10, which is an unprecedented value in monoadduct fullerene derivatives. These materials open up new possibilities of studying the effect of ϵ<sub>r</sub> in organic electronic devices such as organic photovoltaics, organic thermoelectrics, and organic field-effect transistors.</p>