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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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Hummelen, Jan
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2022A method for identifying the cause of inefficient salt-doping in organic semiconductorscitations
- 2022Investigating the dielectric properties and exciton diffusion in C70 derivativescitations
- 2021Molecular Doping Directed by a Neutral Radicalcitations
- 2020Reaching a Double-Digit Dielectric Constant with Fullerene Derivativescitations
- 2020Electrical Conductivity of Doped Organic Semiconductors Limited by Carrier-Carrier Interactionscitations
- 2020N-type organic thermoelectricscitations
- 2017N-Type Organic Thermoelectricscitations
- 2016Deposition of LiF onto Films of Fullerene Derivatives Leads to Bulk Dopingcitations
- 2015Strategy for Enhancing the Dielectric Constant of Organic Semiconductors Without Sacrificing Charge Carrier Mobility and Solubilitycitations
- 2014Strategy for Enhancing the Electric Permittivity of Organic Semiconductors
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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>