Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
There are a number of photovoltaic technologies such as; organic photovoltaics, dye sensitised solar cells, perovskite cells and quantum dots which aim to capitalise on the lower processing cost of roll to roll solution processing. Since 2012 perovskite solar cells have been the most efficient of the solution processed PV technologies. In the early research stage spin coating is often favoured as a convenient method to deposit solution processed solar cells.
Spin coating is limited in commercial production by the high percentage of material wastage, batch processing and constrained substrate size (typically <10cm2). Roll to roll techniques such as slot die coating, flexographic printing and K-bar deposition use less material and have more commercial potential. However during all of these techniques there is no drying of the wet film during deposition and therefore no crystallisation until the heating step. Because of this the drying of the film and subsequent crystallisation of the perovskite is critical to avoid vertical crystal growth which causes a rough perovskite layer with poor surface coverage.
By using an airknife to control the temperature gradient, the crystallisation dynamics of perovskite formation can be controlled. We investigate the effect of the substrate temperature and a cold air knife over the deposited layer on the crystallisation dynamics and we report the performance of devices fully processed in air, with slot die coated perovskite layers, to be as high as 9.2% and comparable to that of cells with spin coated perovskite layers, deposited and annealed in a nitrogen atmosphere.
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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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