Strategies for Tailoring Electrical Conductivity in Metal Halide Perovskite Thin Films through Surface Metal Halide Deposition
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Metal halide perovskites have received a lot of attention in the field of solar cells and light emitting diodes due to their excellent optoelectronic properties. However, despite such interests, electrical doping, which is an intentional tuning of charge carrier density, still remains challenging in metal halide perovskites. Here, we show that the electrical conductivity of methylammonium lead triiodide (MAPbI3), a representative 3D perovskite, can be effectively increased by thermally depositing metal halides on the film surface and that the conductivity level can be tunable by varying the amount of the metal halide deposited. This work would be relevant for enabling effective control of electronic structure and energy band alignments within perovskite-based devices.