English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Organic-inorganic coupling in the hybrid lead-halide perovskite is a centralissue in rationalizing the outstanding photovoltaic performance of theseemerging materials. Here we compare and contrast the evolution of structure anddynamics of the hybrid CH3NH3PbBr3 and the inorganic CsPbBr3 lead-halideperovskites with temperature, using Raman spectroscopy and single-crystal X-raydiffraction. Results reveal a stark contrast between their order-disordertransitions, abrupt for the hybrid whereas smooth for the inorganic perovskite.X-ray diffraction observes an intermediate incommensurate phase between theordered and the disordered phases in CH3NH3PbBr3. Low-frequency Ramanscattering captures the appearance of a sharp soft mode in the incommensuratephase, ascribed to the theoretically predicted amplitudon mode. Our workhighlights the interaction between the structural dynamics of organic cationCH3NH3+ and the lead-halide framework, and unravels the competition betweentendencies of the organic and inorganic moieties to minimize energy in theincommensurate phase of the hybrid perovskite structure.

Interplay between organic cations and inorganic framework and incommensurability in hybrid lead-halide perovskite CH3NH3PbBr3