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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
Places of action
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article
Investigating the dielectric properties and exciton diffusion in C70 derivatives
Abstract
<p>In recent years, the dielectric constant (<i>ε</i><sub>r</sub>) of organic semiconductors (OSCs) has been of interest in the organic photovoltaic (OPV) community due to its potential influence on the exciton binding energy. Despite progress in the design of high <i>ε</i><sub>r</sub> OSCs and the accurate measurement of the <i>ε</i><sub>r</sub>, the effects of the synthetic strategies on specific (opto)electronic properties of the OSCs remain uncertain. In this contribution, the effects of εr on the optical properties of five new C<sub>70</sub> derivatives and [70]PCBM are investigated. Together with [70]PCBM, the derivatives have a range of <i>ε</i><sub>r</sub> values that depend on the polarity and length of the side chains. The properties of the singlet excitons are investigated in detail with steady-state and time-resolved spectroscopy and the exciton diffusion length is measured. All six derivatives show similar photophysical properties in the neat films. However, large differences in the crystallinity of the fullerene films influence the exciton dynamics in blend films. This work shows that design principles for OSCs with a higher <i>ε</i><sub>r</sub> can have a very different influence on the performance of traditional BHJ devices and in neat films and it is important to consider the neat film properties when investigating the optoelectronic properties of new materials for OPV.</p>