Dimensional reduction of the small-bandgap double perovskite Cs₂AgTlBr₆.

ABSTRACT: Quantum confinement effects in lower-dimensional derivatives of the ABX₃ (A = monocation, X = halide) single perovskites afford striking optical and electronic changes, enabling applications ranging from solar absorbers to phosphors and light-emitting diodes. Halide double perovskites form a larger materials family, known since the late 1800s, but lower-dimensional derivatives remain rare and prior work has revealed a minimal effect of quantum confinement on their optical properties. Here, we synthesize three new lower-dimensional derivatives of the 3D double perovskite Cs₂AgTlBr₆: 2D derivatives with mono- (1-Tl) and bi-layer thick (2-Tl) inorganic sheets and a quasi-1D derivative (1'-Tl). Single-crystal ellipsometry studies of these m

SUBMITTER: Connor BA 

PROVIDER: S-EPMC7450713 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature