High pressure behavior of all-inorganic perovskite derivatives

Cs3Sb2X9 X=I, Br metal halide perovskites derivatives of general formula have been proposed as possible less toxic and more stable alternatives to lead-containing materials for a wide range of applications from photovoltaics to photocatalysis. High pressure studies on the iodide containing phases revealed huge improvement of emission as well as metallization at moderate pressures. On the other hand, bromide counterparts have not explored and, in addition, mixed Sb/Bi phases have shown reduction of band gap which deserves further exploration by high pressure diffraction and optical spectroscopy (carried out in our labs). Such coupled exploration of HP behaviour can help in designing novel materials with optimized properties.