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

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

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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