DOI: 10.1039/d6tc02319c ISSN: 2050-7526
Structural evolution, lattice dynamics, and optical properties of one-dimensional CsCu 2 Br 3 halide perovskite with double chains of [CuBr
Leonardo Quintero, Yousra Chakroun, Wajdi Cherif, Carlos A. López, Romualdo S. Silva, Javier Gainza, F. Serrano-Sánchez, Carlos Pecharromán, José Luis Martínez, María Teresa Fernández-Díaz, João Elias F. S. Rodrigues, José Antonio AlonsoMechanosynthesised CsCu 2 Br 3 keeps its Cmcm Cu–Br double chains down to 3 K. Debye analysis of atomic displacements reveals rattler-like Cs ( θ D ≈ 85 K), consistent with a very low thermal conductivity (0.29 W m −1 K −1 , ∼1.5× the amorphous limit).