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

Hot carrier solar cells hold promise for exceeding the Shockley-Queisserlimit. Slow hot carrier cooling is one of the most intriguing properties oflead halide perovskites and distinguishes this class of materials fromcompeting materials used in solar cells. Here we use the element selectivity ofhigh-resolution X-ray spectroscopy to uncover a previously hidden feature inthe conduction band states, the {\sigma}-{\pi} energy separation, and find thatit is strongly influenced by the strength of electronic coupling between theA-cation and bromide-lead sublattice. Our finding provides an alternativemechanism to the commonly discussed polaronic screening and hot phononbottleneck carrier cooling mechanisms. Our work emphasizes the optoelectronicrole of the A-cation, provides a comprehensive view of A-cation effects in theelectronic and crystal structures, and outlines a broadly applicablespectroscopic approach for assessing the impact of chemical alterations of theA-cation on halide and potentially non-halide perovskite electronic structure.

A-site Cation Influence on the Conduction Band of Lead Bromide Perovskites