Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV22)
DOI: https://doi.org/10.29363/nanoge.hopv.2022.092
Publication date: 20th April 2022
Surface photovoltage measurements (SPV) on highly doped semiconductors, such as those used in commercially available photovoltaics and LEDs, can reveal rich information on photoinduced charge dynamics. However, SPV measurements on mixed ionic-electron conductors, such as perovskites, have been poorly understood. We outline a new understanding of SPV measurements, supported by experimental evidence on perovskite bilayers. Our model accurately reproduces these complex SPV measurements, even upon the application of different surface treatments and backing contacts. Importantly, we conclude that the SPV in the perovskite bilayer context can be thought of as a contact-less charge extraction measurement. Our understanding of the SPV measurement in the context of dynamic ionic motion naturally leads to avenues for the selective control of ion migration in perovskite bilayers, demonstrated here by surface passivation treatment. This opens new avenues for the rational design of strategies to improve the photovoltaic properties of perovskite solar cells and LEDs.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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