Abstract
In this paper, a novel morphology transformation of MAPbI3 films which were doped with Rb and prepared by spin coating on a “mp-TiO2/bl-TiO2/FTO” substrate was demonstrated. A slight blue shift of the PL peak for MAPbI3 with increase in RbI concentration was shown. The electronic properties of perovskite films, especially, conductivity type could be significantly tuned from n-type to p-type by doping with Rb. Carrier concentration and mobility could be controlled by adjusting dopant concentration. The investigation of the semiconductor properties of perovskite may shine light on future rational design of novel and more efficient perovskite solar cells.
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