Ionic Conduction Disparity for Solid-State Ion Rectification
발표자
백상은 (한양대학교)
연구책임자
강영종 (한양대학교 화학과)
초록
내용
Halide perovskites offer exceptional optoelectronic properties, but ionic migration challenges device stability. Recently, ion transport has been reinterpreted as a functional mechanism in iontronic devices. Here, we used Cs₄PbBr₆ single crystals as a 0D perovskite platform and locally converted their surfaces to 3D CsPbBr₃ via Prussian blue-mediated CsBr extraction. The resulting heterostructures showed a strong ionic mobility contrast. Time-dependent current under bias revealed negligible decay in Cs₄PbBr₆ but strong, thermally activated decay in CsPbBr₃. Activation energies differed greatly—~2.5 eV for Cs₄PbBr₆ vs. 0.65 eV for CsPbBr₃—enabling polarity-dependent current responses and solid-state ionic rectification.