Lead halide perovskites are promising materials for a range of applications owing to their structural uniqueness and optoelectronic properties. Understanding the relationship between the atomic/superstructures and the associated properties of perovskite materials is vital to fully utilize their potential performances. We present the detailed pressure processing of CsPbBr3 perovskite nanocube superlattices (NC-SLs) for the first time. By using a diamond anvil cell combined with in situ synchrotron-based small/wide angle X-ray scattering (SAXS and WAXS) and photoluminescence (PL) probes (shown A in the Figure), the NC-SL transformations are correlated at both atomic and superlattice levels with the PL transition through a pressure cycle of 0 ↔ 17.5 GPa. <i>In-situ</i> SAXS and WAXS measurements monitored its mechanical and structural changes showing that the NC-SL went through multiple phase transitions both at both atomic and superlattice levels. After the pressure process, the individual CsPbBr3 NCs fused into two-dimensional nanoplatelets (NPLs) with a uniform thickness (~10.1 nm). The pressure-synthesized perovskite NPLs exhibited a pure single cubic crystal structure, a 1.6-fold enhanced photoluminescence quantum yield, and a longer emission lifetime than the starting NCs. These results suggest that pressure processing can provide a novel approach for the quick conversion of lead halide perovskites into structures with enhanced properties.

Cesium lead bromide perovskite nanocube superlattices and the pressure-induced change in its structure and optical properties

254th National Meeting (2017)

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