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Despite fast development of hybrid perovskite solar cells, there are many fundamental questions related to the perovskite film which remain open. For example, there are contradicting theoretical reports on the role of the organic methylammonium cation (CH3NH3+) in the methylammonium lead triiodide (CH3NH3PbI3) perovskite film. From one side it is reported that the organic cation does not contribute...
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