Homogenized halides and alkali cation segregation in alloyed organic-inorganic perovskites

See allHide authors and affiliations

Science  08 Feb 2019:
Vol. 363, Issue 6427, pp. 627-631
DOI: 10.1126/science.aah5065

You are currently viewing the editor's summary.

View Full Text

Log in to view the full text

Log in through your institution

Log in through your institution

Advantages of adding just enough alkalis

For organic-inorganic hybrid solar cells, addition of cesium or rubidium cations can improve power conversion efficiency. Correa-Baena et al. used nanoscale x-ray fluorescence imaging to show that the addition of metal cations at low concentrations homogenized the distribution of bromide and iodide anions and also increased charge-carrier lifetimes. However, at high concentrations, aggregation and cluster formation led to increased charge recombination.

Science, this issue p. 627