- Organic photovoltaics (PV) is an energy-harvesting technology that offers many advantages, such as flexibility, low weight and cost, as well as environmentally benign materials and manufacturing techniques. Despite growth of power conversion efficiencies to around 19 % in the last years, organic PVs still lag behind inorganic PV technologies, mainly due to high losses in open-circuit voltage. Understanding and improving open circuit voltage in organic solar cells is challenging, as it is controlled by the properties of a donor-acceptor interface where the optical excitations are separated into charge carriers. Here, we provide an electrostatic model of a rough donor-acceptor interface and test it experimentally on small molecule PV materials systems. The model provides concise relationships between the open-circuit voltage, photovoltaic gap, charge-transfer state energy, and interfacial morphology. In particular, we show that the electrostatic bias generated across the interface reduces the photovoltaic gap. This negative influence onOrganic photovoltaics (PV) is an energy-harvesting technology that offers many advantages, such as flexibility, low weight and cost, as well as environmentally benign materials and manufacturing techniques. Despite growth of power conversion efficiencies to around 19 % in the last years, organic PVs still lag behind inorganic PV technologies, mainly due to high losses in open-circuit voltage. Understanding and improving open circuit voltage in organic solar cells is challenging, as it is controlled by the properties of a donor-acceptor interface where the optical excitations are separated into charge carriers. Here, we provide an electrostatic model of a rough donor-acceptor interface and test it experimentally on small molecule PV materials systems. The model provides concise relationships between the open-circuit voltage, photovoltaic gap, charge-transfer state energy, and interfacial morphology. In particular, we show that the electrostatic bias generated across the interface reduces the photovoltaic gap. This negative influence on open-circuit voltage can, however, be circumvented by adjusting the morphology of the donor-acceptor interface.
Organic solar cells, despite their high power conversion efficiencies, suffer from open circuit voltage losses making them less appealing in terms of applications. Here, the authors, supported with experimental data on small molecule photovoltaic cells, relate open circuit voltage to photovoltaic gap, charge-transfer state energy, and donor-acceptor interfacial morphology.…
MetadatenVerfasserangaben: | Carl PoelkingGND, Johannes BenduhnORCiDGND, Donato SpoltoreORCiD, Martin SchwarzeORCiDGND, Steffen RolandGND, Fortunato Piersimoni, Dieter NeherORCiDGND, Karl LeoORCiDGND, Koen VandewalORCiD, Denis AndrienkoORCiD |
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DOI: | https://doi.org/10.1038/s42005-022-01084-x |
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ISSN: | 2399-3650 |
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Titel des übergeordneten Werks (Englisch): | Communications physics |
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Untertitel (Englisch): | interfacial roughness makes the difference |
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Verlag: | Nature portfolio |
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Verlagsort: | Berlin |
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Publikationstyp: | Wissenschaftlicher Artikel |
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Sprache: | Englisch |
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Datum der Erstveröffentlichung: | 29.11.2022 |
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Erscheinungsjahr: | 2022 |
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Datum der Freischaltung: | 01.11.2023 |
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Band: | 5 |
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Ausgabe: | 1 |
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Aufsatznummer: | 307 |
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Seitenanzahl: | 7 |
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Fördernde Institution: | KAUST Office of Sponsored Research (OSR) [OSR-2018-CARF/CCF-3079,; OSR-CRG2018-3746]; Deutsche Forschungsgemeinschaft (DFG, German Research; Foundation) [SPP 2196, 460766640, TRR 146]; German Federal Ministry of; Education and Research (BMBF) [16ME0012, 01DR20008A] |
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Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
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DDC-Klassifikation: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
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Peer Review: | Referiert |
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Publikationsweg: | Open Access / Gold Open-Access |
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| DOAJ gelistet |
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Lizenz (Deutsch): | CC-BY - Namensnennung 4.0 International |
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