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Welsh Researchers Supersize Perovskite Solar Technology

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Researchers from Swansea University in Wales have declared a perovskite solar module the size of an A4 sheet of paper, (nearly six times bigger than 10x10 cm2 modules of that type reported before), developed by using simple and low-cost printing techniques. The accomplishment shows that the technology works at a larger scale, not just in the lab, which is crucial for commercial use.

The team works for the SPECIFIC Innovation and Knowledge Center led by Swansea University. The researchers used an existing type of cell, a Carbon Perovskite Solar Cell (C-PSC), made of different layers - titania, zirconia and carbon on top - which are all printable. Though their efficiency is lower than other perovskite cell types, C-PSCs do not degrade as quickly, which has been established through 1 year of stable operation under illumination.

The Swansea team's breakthrough reportedly comes from the optimization of the printing process on glass substrates as large as an A4 sheet of paper. They ensured the patterned layers were perfectly aligned through a method called registration, well-known in the printing industry. The entire fabrication process was carried out in air, at ambient conditions, without requiring the costly high-vacuum processes which are needed for silicon manufacture.

Dr Francesca De Rossi, technology transfer fellow at Swansea University's SPECIFIC Innovation and Knowledge Center, said: "Our work shows that perovskite solar cells can deliver good performance even when produced on a larger scale than reported so far within the scientific community. This is vital in making it economical and appealing for industry to manufacture them. The key to our success was the screen printing process. We optimized this to avoid defects caused by printing such large areas. Accurate registration of layers and patterning the blocking layer helped improve connections between cells, boosting overall performance. There is more work still to do, for example on increasing the active area - the percentage of the substrate surface that is actually used for producing power. We are already working on it. But this is an important breakthrough by our team, which can help pave the way for the next generation of solar cells"

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