The Effect of Thermal Annealing on Charge Transport in Organolead Halide Perovskite Microplate Field‐Effect Transistors

Transformation of unipolar n-type semiconductor behavior to ambipolar and finally to unipolar p-type behavior in CH3NH3PbI3 microplate field-effect transistors by thermal annealing is reported. The photoluminescence spectra essentially maintain the same features before and after the thermal annealing process, demonstrating that the charge transport measurement provides a sensitive way to probe low-concentration defects in perovskite materials.