Researchers at the Okinawa Institute of Science and Technology Graduate University (OIST) have eliminated problematic pinholes in the top layer of next-generation solar cells in development. At the same time, they have significantly improved the lifetime of the solar cell and made it thinner. The findings were recently published in Scientific Reports.
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Ref: Substantial improvement of perovskite solar cells stability by pinhole-free hole transport layer with doping engineering. Scientific Reports (2015) | DOI:10.1038/srep09863