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11. The Role of SnF2 Additive on Interface Formation in All Lead‐Free FASnI3 Perovskite Solar Cells.

Author

Zillner, Julia, Boyen, Hans‐Gerd, Schulz, Philip, Hanisch, Jonas, Gauquelin, Nicolas, Verbeeck, Johan, Küffner, Johannes, Desta, Derese, Eisele, Lisa, Ahlswede, Erik, and Powalla, Michael

Subjects
SOLAR cells, SECONDARY ion mass spectrometry, PEROVSKITE, X-ray photoelectron spectroscopy, PHOTOVOLTAIC power systems, HARD X-rays, SOFT X rays
Abstract

Tin‐based perovskites are promising alternative absorber materials for lead‐free perovskite solar cells but need strategies to avoid fast tin (Sn) oxidation. Generally, this reaction can be slowed down by the addition of tin fluoride (SnF2) to the perovskite precursor solution, which also improves the perovskite layer morphology. Here, this work analyzes the spatial distribution of the additive within formamidinium tin triiodide (FASnI3) films deposited on top of poly(3,4‐ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole transporting layers. Employing time‐of‐flight secondary ion mass spectrometry and a combination of hard and soft X‐ray photoelectron spectroscopy, it is found that SnF2 preferably accumulates at the PEDOT:PSS/perovskite interface, accompanied by the formation of an ultrathin SnS interlayer with an effective thickness of ≈1.2 nm. [ABSTRACT FROM AUTHOR]

Published
2022
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12. Hydrophobic Graphene Quantum Dots for Defect Passivation and Enhanced Moisture Stability of CH3NH3PbI3 Perovskite Solar Cells.

Author

Khorshidi, Elahe, Rezaei, Behzad, Blätte, Dominic, Buyruk, Ali, Reus, Manuel A., Hanisch, Jonas, Böller, Bernhard, Müller-Buschbaum, Peter, and Ameri, Tayebeh

Subjects
SOLAR cells, PEROVSKITE, X-ray photoelectron spectroscopy, GRAPHENE, PASSIVATION, OPEN-circuit voltage, QUANTUM dots, PHOTOLUMINESCENCE measurement
Abstract

Passivating the defects and grain boundaries (GBs) of perovskite films at the interface by interface engineering is a promising route to achieve efficient and stable perovskite solar cells (PSCs). Herein, a new type of graphene, that is, hydrophobic graphene quantum dots (HGQDs) containing amide linkages, which consist of carbonyl and dodecyl amine groups, is successfully used as a bifunctional interface modifier to engineer the interface of the perovskite/hole transport layer. A comprehensive characterization including X‐ray photoelectron spectroscopy, Fourier‐transform photocurrent spectroscopy, Raman spectroscopy, photoluminescence spectroscopy, and space‐charge‐limited current measurements is performed to identify the underlying passivation mechanisms. It can be demonstrated that the HGQDs, due to the bifunctional groups containing N and O atoms, effectively passivate the uncoordinated Pb2+ ions at the perovskite film surface and GBs and consequently induce a lower trap state density. Moreover, HGQDs enhance the quality of the perovskite film which reduces the charge recombination at the interface. Therefore, the power conversion efficiency of PSCs treated with HGQDs is significantly increased from 16.00% to 18.30%, mainly based on the improved open‐circuit voltage and fill factor. Importantly, the HGQDs featuring hydrophobicity due to alkyl chains significantly enhance moisture stability. [ABSTRACT FROM AUTHOR]

Published
2022
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16. Perovskite Solar Cells: Understanding the Role of Cesium and Rubidium Additives in Perovskite Solar Cells: Trap States, Charge Transport, and Recombination (Adv. Energy Mater. 16/2018)

Author

Hu, Yinghong, primary, Hutter, Eline M., additional, Rieder, Philipp, additional, Grill, Irene, additional, Hanisch, Jonas, additional, Aygüler, Meltem F., additional, Hufnagel, Alexander G., additional, Handloser, Matthias, additional, Bein, Thomas, additional, Hartschuh, Achim, additional, Tvingstedt, Kristofer, additional, Dyakonov, Vladimir, additional, Baumann, Andreas, additional, Savenije, Tom J., additional, Petrus, Michiel L., additional, and Docampo, Pablo, additional

Published
2018
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19. Understanding the Role of Cesium and Rubidium Additives in Perovskite Solar Cells: Trap States and Charge Carrier Mobility

Author

Hu, Yinghong, primary, Docampo, Pablo, additional, Rieder, Philipp, additional, Grill, Irene, additional, Hanisch, Jonas, additional, Aygüler, Meltem F., additional, Hufnagel, Alexander G., additional, Handloser, Matthias, additional, Hutter, Eline M., additional, Hartschuh, Achim, additional, Tvingstedt, Kristofer, additional, Dyakonov, Vladimir, additional, Baumann, Andreas, additional, Savenije, Tom J., additional, Petrus, Michiel L., additional, and Bein, Thomas, additional

Published
2018
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20. Understanding the Role of Cesium and Rubidium Additives in Perovskite Solar Cells: Trap States, Charge Transport, and Recombination

Author

Hu, Yinghong, primary, Hutter, Eline M., additional, Rieder, Philipp, additional, Grill, Irene, additional, Hanisch, Jonas, additional, Aygüler, Meltem F., additional, Hufnagel, Alexander G., additional, Handloser, Matthias, additional, Bein, Thomas, additional, Hartschuh, Achim, additional, Tvingstedt, Kristofer, additional, Dyakonov, Vladimir, additional, Baumann, Andreas, additional, Savenije, Tom J., additional, Petrus, Michiel L., additional, and Docampo, Pablo, additional

Published
2018
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22. Understanding the effect of solvent vapor annealing on solution-processed A–D–A oligothiophene bulk-heterojunction solar cells: the role of alkyl side chains

Author

Wessendorf, Cordula D., primary, Perez-Rodriguez, Ana, additional, Hanisch, Jonas, additional, Arndt, Andreas P., additional, Ata, Ibrahim, additional, Schulz, Gisela L., additional, Quintilla, Aina, additional, Bäuerle, Peter, additional, Lemmer, Uli, additional, Wochner, Peter, additional, Ahlswede, Erik, additional, and Barrena, Esther, additional

Published
2016
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23. Optimierung von Kathoden und Zwischenschichten für Polymersolarzellen

Author

Hanisch, Jonas and Lemmer, U.

Subjects
Kathode, Organische Solarzellen, ddc:620, SIMS, Sputtern, Engineering & allied operations, semitransparent
Abstract

Diese Arbeit beschäftigt sich mit dem Einfluss der Kathode auf die Eigenschaften von Polymersolarzellen. Neben der Untersuchung verschiedener Abscheidearten liegt der Schwerpunkt vor allem auf der Erforschung der Wirkungsweise von Zwischenschichten. Analysen mittels Sekundärteilchenmassenspektrometrie (SIMS und SNMS) erlauben Einblick in die dahinterliegenden Wechselwirkungen und Mechanismen. Die gewonnenen Kenntnisse werden in der Realisierung von semitransparenten Solarzellen eingesetzt.

Published
2010

24. Efficiency Improvement of Solution-Processed Dithienopyrrole-Based A-D-A Oligothiophene Bulk-Heterojunction Solar Cells by Solvent Vapor Annealing

Author

Wessendorf, Cordula D., primary, Schulz, Gisela L., additional, Mishra, Amaresh, additional, Kar, Prasenjit, additional, Ata, Ibrahim, additional, Weidelener, Martin, additional, Urdanpilleta, Marta, additional, Hanisch, Jonas, additional, Mena-Osteritz, Elena, additional, Lindén, Mika, additional, Ahlswede, Erik, additional, and Bäuerle, Peter, additional

Published
2014
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32. An Effective Single Solar Cell Equivalent Circuit Model for Two or More Solar Cells Connected in Series

Author

Bauer, Andreas, Hanisch, Jonas, and Ahlswede, Erik

Abstract

We report on the development of a simplified single solar cell equivalent circuit model which describes two or more solar cells that are connected in series with the device parameters of a single effective solar cell. The model depends only on the voltage that is applied to the device, and effective device parameters can be calculated from subcell parameters. The constraints for the applicability of the effective model are discussed. The effective model is applicable if it is possible to determine its effective diode parameters-either by calculation or by extraction from data.

Published
2014
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33. The Role of SnF2 Additive on Interface Formation in All Lead-Free FASnI3 Perovskite Solar Cells

Author

Julia Zillner, Hans‐Gerd Boyen, Philip Schulz, Jonas Hanisch, Nicolas Gauquelin, Johan Verbeeck, Johannes Küffner, Derese Desta, Lisa Eisele, Erik Ahlswede, Michael Powalla, Gauquelin, Nicolas/0000-0002-5555-7055, Zillner, Julia, BOYEN, Hans-Gerd, Schulz, Philip, Hanisch, Jonas, Gauquelin, Nicolas, Kueffner, Johannes, Verbeeck, Johan, DESTA, Derese, Eisele, Lisa, Ahlswede, Erik, and Powalla, Michael

Subjects
Biomaterials, Lead-free, poly(styrenesulfonate), Sn-based perovskite solar cells, SnF2 additives, Electrochemistry, Condensed Matter Physics, SnS interlayer, time-of-flight secondary ion mass spectrometry, hard X-ray photoelectron spectroscopy, poly(3,4-ethylenedioxythiophene), perovskite, Electronic, Optical and Magnetic Materials
Abstract

Tin-based perovskites are promising alternative absorber materials for leadfree perovskite solar cells but need strategies to avoid fast tin (Sn) oxidation. Generally, this reaction can be slowed down by the addition of tin fluoride (SnF2) to the perovskite precursor solution, which also improves the perovskite layer morphology. Here, this work analyzes the spatial distribution of the additive within formamidinium tin triiodide (FASnI(3)) films deposited on top of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) hole transporting layers. Employing time-of-flight secondary ion mass spectrometry and a combination of hard and soft X-ray photoelectron spectroscopy, it is found that Sn F2 preferably accumulates at the PEDOT:PSS/perovskite interface, accompanied by the formation of an ultrathin SnS interlayer with an effective thickness of approximate to 1.2 nm. This project received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No. 850937 (PERCISTAND). H.-G.B. and D.D. are very grateful to the Research Foundation Flanders (FWO) for funding the HAXPES-lab instrument within the HERCULES program for Large Research Infrastructure of the Flemish government. P.S. thanks the French Agence Nationale de la Recherche for funding under the contract number ANR-17-MPGA-0012. This work was supported by the Federal Ministry for Economic Affairs and Energy (BMWi) Germany under the contract number 03EE1038A (CAPITANO) and financed by the Ministry of Science, Research and the Arts of Baden-Wurttemberg as part of the sustainability financing of the projects of the Excellence Initiative II (KSOP).

Published
2022

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