Extended Data Fig. 6: XRD of FASnI3 nanocrystal superlattices.
From: Slow carrier relaxation in tin-based perovskite nanocrystals
(a) XRD patterns of FASnI3 nanocrystal superlattices prepared by dropcasting nanocrystal solutions on glass substrates. The temperatures refer to the nanocrystal synthesis. (b) Magnified view of the 2θ ∼ 14° reflection of the superlattice constructed from the 110 °C nanocrystals. The x-axis is transformed to the scattering vector q = 4π sin(θ)/λ. Due to the periodicity of the superlattice, the Bragg reflection is split into a series of satellite peaks (indicated by blue lines). Inset: Plot of the satellite positions qn vs. the satellite peak n. The mean centre-to-centre distance between the nanocrystals in the superlattice Λ is given by Λ = 2π n/q.
