Uli Würfel, Lorena Perdigón-Toro, Jona Kurpiers, Christian Michael Wolff, Pietro Caprioglio, Jeromy James Rech, Jingshuai Zhu, Xiaowei Zhan, Wei You, Safa Shoaee, Dieter Neher, Martin Stolterfoht
- Charge extraction in organic solar cells (OSCs) is commonly believed to be limited by bimolecular recombination of photogenerated charges. However, the fill factor of OSCs is usually almost entirely governed by recombination processes that scale with the first order of the light intensity. This linear loss was often interpreted to be a consequence of geminate or trap-assisted recombination. Numerical simulations show that this linear dependence is a direct consequence of the large amount of excess dark charge near the contact. The first-order losses increase with decreasing mobility of minority carriers, and we discuss the impact of several material and device parameters on this loss mechanism. This work highlights that OSCs are especially vulnerable to injected charges as a result of their poor charge transport properties. This implies that dark charges need to be better accounted for when interpreting electro-optical measurements and charge collection based on simple figures of merit.
MetadatenAuthor details: | Uli Würfel, Lorena Perdigón-ToroORCiDGND, Jona KurpiersORCiDGND, Christian Michael WolffORCiDGND, Pietro CaprioglioORCiDGND, Jeromy James RechORCiD, Jingshuai Zhu, Xiaowei ZhanORCiD, Wei YouORCiD, Safa ShoaeeORCiDGND, Dieter NeherORCiDGND, Martin StolterfohtORCiDGND |
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DOI: | https://doi.org/10.1021/acs.jpclett.9b01175 |
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ISSN: | 1948-7185 |
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Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/31146523 |
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Title of parent work (English): | The journal of physical chemistry letters |
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Publisher: | American Chemical Society |
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Place of publishing: | Washington |
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Publication type: | Article |
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Language: | English |
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Date of first publication: | 2019/06/20 |
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Publication year: | 2019 |
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Release date: | 2021/01/20 |
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Volume: | 10 |
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Issue: | 12 |
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Number of pages: | 15 |
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First page: | 3473 |
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Last Page: | 3480 |
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Funding institution: | NSFNational Science Foundation (NSF) [CBET-1639429]; Sofia Kovalevskaya Award from the Alexander von Humboldt FoundationAlexander von Humboldt Foundation; HyPerCells -a joint graduate school of the Potsdam University; HZBHelmholtz Association; Deutsche Forschungsgesellschaft (DFG)German Research Foundation (DFG) [NE 410/13-1, NE410/15-1, INST 336/94-1 FUGG] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
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Peer review: | Referiert |
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