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Infiltration of mesoporous TiO2 scaffolds by CH3NH3PbI3 is more complete when using sequential compared to single step deposition processing and avoids formation of disordered capping layers affording greatly improved performance of perovskite based photovoltaics.
Christophe Ballif, Aïcha Hessler-Wyser, Antonin Faes, Umang Bhupatrai Desai, Kléber Nicolet-dit-Félix