Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
Organic photovoltaics (OPV) are very light weight and flexible and a high variety in free-form design is possible compared with silicon based technologies. The long-term durability of OPV-modules is a big challenge especially they must be particularly protected from moisture and UV radiation. To keep light weight and highly flexible properties in an OPV final product it is therefore, it is obvious to use flexible substrates as front and back sheets. To ensure the protective effect, it is necessary to coat these substrates with metal oxides.
In this article, the factors influencing water vapor permeation barriers are presented and a new type of PET substrate film is introduced. It has an ultra-clean and defect free surface, which is a requirement to achieve water vapor transmission rates of less than 1∙10-3 g/(m²d) by coating of thin oxide films. Here results of metal oxide single layers with less than 100 nm thickness, deposited in a reactive magnetron sputter process in a roll to roll coater are presented.
For OPV application a high UV and hydrolysis stabilization is required for the front sheet to realize a service life of up to 35 years.
Finally, a current interim status is shown of how the front sheet performs after several thousand hours under damp-heat conditions.
Parts of the presented results were developed within the EU project BOOSTER (grant agreement No 952911).
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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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