| People | Locations | Statistics |
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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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Di Nuzzo, Daniele
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2020Circularly Polarized Photoluminescence from Chiral Perovskite Thin Films at Room Temperaturecitations
- 2020A general approach for hysteresis-free, operationally stable metal halide perovskite field-effect transistors.
- 2020A general approach for hysteresis-free, operationally stable metal halide perovskite field-effect transistors.
- 2020Graphene-passivated nickel as an efficient hole-injecting electrode for large area organic semiconductor devicescitations
- 2017Ultrafast Charge and Triplet State Formation in Diketopyrrolo-pyrrole Low Band gap Polymer/Fullerene Blends: Influence of Nanoscale Morphology of Organic Photovoltaic Materials on Charge Recombination to the Triplet State
- 2017Ultrafast charge and triplet state formation in Diketopyrrolopyrrole Low Band Gap Polymer/Fullerene blendscitations
- 2016 Improved performance of perovskite light-emitting diodes using a PEDOT:PSS and MoO3 composite layer
- 2010Efficient solar cells based on an easily accessible diketopyrrolopyrrole polymercitations
- 2010Improved Film Morphology Reduces Charge Carrier Recombination into the Triplet Excited State in a Small Bandgap Polymer‐Fullerene Photovoltaic Cellcitations
Places of action
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article
Ultrafast Charge and Triplet State Formation in Diketopyrrolo-pyrrole Low Band gap Polymer/Fullerene Blends: Influence of Nanoscale Morphology of Organic Photovoltaic Materials on Charge Recombination to the Triplet State
Abstract
Femtosecond transient absorption spectroscopy of thin films of two types of morphologies of diketopyrrolo-pyrrole low band gap polymer / fullerene-adduct blends are presented and indicate triplet state formation by charge recombination, an important loss channel in organic photovoltaic materials. At low laser fluence (approaching solar intensity) charge formation characterized by a 1350 nm band (in ~ 250 fs) dominates in the two PDPP-PCBM blends with different nanoscale morphology and these charges recombine to form a local polymer based triplet state on the sub-ns timescale (in ~300 and ~900 ps) indicated by an 1100 nm absorption band. The rate of triplet state formation is influenced by the morphology. The slower rate of charge recombination to the triplet state (in ~900 ps) corresponds to a morphology that results in a higher power conversion efficiency in the corresponding device. Nanoscale morphology not only influences interfacial area and conduction of holes and electrons, the mechanism of Inter System Crossing (ISC) can be influenced, too. We present a model that correlates morphology to the exchange integral and fast and slow mechanisms for ISC (SOCT-ISC and H-HFI-ISC). For the pristine polymer, a flat unstructured singlet-singlet absorption spectrum (between 900-1400 nm) and very minor triplet state formation (5 %) is observed at low laser-fluence.