A (PEA)2PbI4 (2D) layer deposited
on a MAPbI3 (3D) film undergoes a transformation upon photoirradiation
and thermal treatment. The decrease in absorption and emission of
the 2D layer during light and heat exposure, which shows migration
of the PEA+ cation
within the 3D film, points out the dynamic nature of the 2D/3D interface
and intermixing of the two phases.
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