Enhanced visible light absorption in layered Cs
3
Bi
2
Br
9
through mixed-valence Sn(II) / Sn(IV) doping
Keyword(s):
Lead-free halides with perovskite-related structures, such as the vacancy-ordered perovskite Cs3Bi2Br9,are of interest for photovoltaic and optoelectronic applications. We find that addition of SnBr2 to the solution-phase synthesis of...