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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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Österbacka, Ronald
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2021Fluorination of pyrene-based organic semiconductors enhances the performance of light emitting diodes and halide perovskite solar cellscitations
- 2020Fluorination of pyrene-based organic semiconductors enhances the performance of light emitting diodes and halide perovskite solar cellscitations
- 2020Fluorination of pyrene-based organic semiconductors enhances the performance of light emitting diodes and halide perovskite solar cellscitations
- 2020Investigation of well-defined pinholes in TiO 2 electron selective layers used in planar heterojunction perovskite solar cellscitations
- 2020Investigation of well-defined pinholes in TiO2 electron selective layers used in planar heterojunction perovskite solar cellscitations
- 2019Eco-friendly and low-cost phenothiazine-based hole-transporting material for high performance perovskite solar cells
- 2017Impact of Film Thickness of Ultrathin Dip-Coated Compact TiO2 Layers on the Performance of Mesoscopic Perovskite Solar Cellscitations
- 2014Impact of humidity on functionality of on-paper printed electronicscitations
- 2013Printability of functional inks on multilayer curtain coated papercitations
- 2012IR-sintering of ink-jet printed metal-nanoparticles on papercitations
- 2011Towards paper electronics - printing transistors on paper in a roll-to-roll process
- 2010Organic Spintronicscitations
- 2008Tuning the electrical switching of polymer/fullerene nanocomposite thin film devices by control of morphologycitations
- 2008Roll-to-Roll Fabrication of Bulk Heterojunction plastic solar cells using the reverse gravure coating techniquecitations
- 2008Organic memory using [6,6]-phenyl-C 61 butyric acid methyl ester:Morphology, thickness and concentration dependence studiescitations
- 2008Roll-to-roll fabrication of bulk heterojunction plastic solar cells using the reverse gravure coating techniquecitations
- 2007Metallic nanoparticles in a polymeric matrix
- 2007Metallic nanoparticles in a polymeric matrix:Electrical impedance switching and negative differential resistance
- 2005A novel method to orient semiconducting polymer filmscitations
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article
Impact of Film Thickness of Ultrathin Dip-Coated Compact TiO2 Layers on the Performance of Mesoscopic Perovskite Solar Cells
Abstract
<p>Uniform and pinhole-free electron-selective TiO<sub>2</sub> layers are of utmost importance for efficient perovskite solar cells. Here we used a scalable and low-cost dip-coating method to prepare uniform and ultrathin (5–50 nm) compact TiO<sub>2</sub> films on fluorine-doped tin oxide (FTO) glass substrates. The thickness of the film was tuned by changing the TiCl<sub>4</sub> precursor concentration. The formed TiO<sub>2</sub> follows the texture of the underlying FTO substrates, but at higher TiCl<sub>4</sub> concentrations, the surface roughness is substantially decreased. This change occurs at a film thickness close to 20–30 nm. A similar TiCl<sub>4</sub> concentration is needed to produce crystalline TiO<sub>2</sub> films. Furthermore, below this film thickness, the underlying FTO might be exposed resulting in pinholes in the compact TiO<sub>2</sub> layer. When integrated into mesoscopic perovskite solar cells there appears to be a similar critical compact TiO<sub>2</sub> layer thickness above which the devices perform more optimally. The power conversion efficiency was improved by more than 50% (from 5.5% to ∼8.6%) when inserting a compact TiO<sub>2</sub> layer. Devices without or with very thin compact TiO<sub>2</sub> layers display <i>J</i>–<i>V</i> curves with an “s-shaped” feature in the negative voltage range, which could be attributed to immobilized negative ions at the electron-extracting interface. A strong correlation between the magnitude of the s-shaped feature and the exposed FTO seen in the X-ray photoelectron spectroscopy measurements indicates that the s-shape is related to pinholes in the compact TiO<sub>2</sub> layer when it is too thin.</p>