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Hwang, Kyeongil
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article
Printing-friendly sequential deposition via intra-additive approach for roll-to-roll production of perovskite solar cells
Abstract
We report organic cation additives in lead iodide solutions as a practical approach for roll-to-roll production of perovskite solar cells. Sequential deposition, which is known to be more reliable than 1 step process, is modified to be even more reliable and suitable in roll-to-roll process. Addition of less than stoichiometric amount of organic cations in PbI2 solution effectively improves processability by working as crystallization retardant and make dried PbI2 film more reactive for faster conversation to perovskite. The printing-friendly sequential deposition is used with slot die coating, an industrial up-scaling technique, to produce a perovskite solar cell on glass with a 14.4% power conversion efficiency (PCE). The process is then used in actual roll-to-roll machine to produce flexible perovskite solar cells with up to 11.0% PCE