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Stable Methylammonium-Free p-i-n Perovskite Solar Cells and Mini-Modules with Phenothiazine Dimers as Hole-Transporting Materials Luigi Angelo Castriotta, Rossella Infantino, Luigi Vesce, Maurizio Stefanelli, https://t.co/Q59IuRjqZV https://t.co/dDyIRirxc