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 perovskite materials are revolutionizing photovoltaics with high power conversion efficiencies, but experience significant environmental degradation and instability. In this work, the phase stability and decomposition mechanisms of lead-free all inorganic Cs2SnI6 perovskite upon water and moisture exposure were systematically investigated via in situ synchrotron X-ray diffraction, environmental SEM, and micro-Raman spectroscopy. A critical relative humidity (80%) is identified below which Cs2SnI6 perovskite is stable without decomposition. Under higher humidity or aqueous environment, Cs2SnI6 perovskite decomposes into SnI4 and CsI through etch pits formation and stepwave propagation, leading to rapid crystal dissolution. A partial reversibility of the Cs2SnI6 perovskite upon dissolution and re-precipitation with subsequent dehydration was identified, suggesting a self-healing capability of Cs2SnI6 and thus enhanced air stability. Mechanistic understanding of the Cs2SnI6 degradation behavior can be a vital step towards developing new perovskites with enhanced environmental stability and materials performance.Perovskite properties: Stability when wetThe perovskite Cs2SnI6 has been investigated using numerous in-situ techniques to understand its environmental stability. While organic–inorganic perovskites show great promise for photovoltaic applications, their poor stability remains a problem. Perovskite Cs2SnI6 shows enhanced stability properties, however, how it degrades is not fully understood. Now a team lead by Jie Lian at the Rensselaer Polytechnic Institute, USA, has investigated the phase stability and decomposition mechanisms of Cs2SnI6 when exposed to moisture. This systematic study used in-situ synchrotron X-ray diffraction, environmental scanning electron microscopy and micro-Raman spectroscopy and discovered that there was a critical relative humidity of 80% above which Cs2SnI6 decomposes into SnI4 and CsI. They attribute the degradation process to etch pit formation on the surface of the crystals, which results in the dissolution of the entire crystal through a stepwave model.

Deciphering the degradation mechanism of the lead-free all inorganic perovskite Cs2SnI6