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Title: | Open-circuit voltage of organic solar cells: interfacial roughness makes the difference | Authors: | Poelking, Carl Benduhn, Johannes SPOLTORE, Donato Schwarze, Martin Roland, Steffen PIERSIMONI, Fortunato Neher, Dieter Leo, Karl VANDEWAL, Koen Andrienko, Denis |
Issue Date: | 2022 | Publisher: | NATURE PORTFOLIO | Source: | Communications Physics, 5 (1) (Art N° 307) | Abstract: | 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 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. | Notes: | Andrienko, D (corresponding author), Max Planck Inst Polymer Res, Ackermannweg 10, D-55128 Mainz, Germany.; Vandewal, K (corresponding author), Hasselt Univ, Inst Mat Oonderzoek IMOMEC, Diepenbeek, Belgium. koen.vandewal@uhasselt.be; denis.andrienko@mpip-mainz.mpg.de |
Document URI: | http://hdl.handle.net/1942/39114 | ISSN: | 2399-3650 | e-ISSN: | 2399-3650 | DOI: | 10.1038/s42005-022-01084-x | ISI #: | 000890286400002 | Rights: | The Author(s) 2022. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/ licenses/by/4.0/. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2023 |
Appears in Collections: | Research publications |
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Open-circuit voltage of organic solar cells_ interfacial roughness makes the difference.pdf | Published version | 1.02 MB | Adobe PDF | View/Open |
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