Abstract
Solar Cell Materials Although lead-based inorganic-organic perovskite solar cells can have efficiencies of up to ~20%, degradation of these materials during use can create water-soluble byproducts that could potentially release toxic lead ions into the environment. Slavney et al. report on an inorganic bismuth-based “double perovskite” (one in which the B and B′ sites alternate in the lattice) that has an indirect band gap of 1.95 electron volts, which is suitable for use as a tandem layer over a silicon solar cell. The material, Cs2AgBiBr6, is highly stable against heat and moisture and shows a photoluminescent lifetime of 600 ns, which suggests that carrier lifetimes may be long enough to achieve high efficiency. J. Am. Chem. Soc. 10.1021/jacs.5b13294 (2016).
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