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XRD patterns of as-synthesized (A) and annealed (B) powders obtained by a standard diffractometer. The reference kesterite CZTS pattern is shown in black, the SnS reference pattern in green, and the SnS peaks are marked by (▼). SnS is present in each as-synthesized powder except from C, along with unidentified phases as shown in the inset in (A). The thermal treatment appears to purify the CZTS phase.
