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. 2020 Oct 23;6(43):eabb1336. doi: 10.1126/sciadv.abb1336

Fig. 1. Structural and optoelectronic properties modulated by alkali cations.

Fig. 1

(A) XRD patterns, (B) the lattice constants, and (C) the FWHM of the perovskite peak. The lattice constants and FWHM were extracted from the peak at around 14°. a.u., arbitrary unit. (D) Steady-state PL spectra. (E) Time-resolved PL decay curves for samples with different cation combinations. Elongation of PL lifetime is observed with the addition of alkali cations.