Synthesis of large two-dimensional lead-free bismuth–silver double perovskite microplatelets and their application for field-effect transistors

Abstract

Two-dimensional phenylethylammonium (PEA, C₈H₉NH₃) Bi–Ag double perovskite (PEA)₄BiAgX₈ (X = Br, I) microplatelets are synthesized for the first time via a facile self-assembly recrystallization method. Absorption spectra of microplatelets exhibit direct bandgaps and different halide compositions show distinct morphologies and bandgap tunability. Field-effect transistors based on a single (PEA)₄BiAgBr₈ microplatelet display a p-type semiconducting behavior.