For the past years, perovskites have demonstrated their tremendous potential as solar cells reaching up to 25.5%  yield as a single cell, when the Shockley-Queisser limit is around 30.5%. To overpass this limit, much attention is now paid on silicon/perovskite devices which could allow yields as high as 42%  with an appropriate perovskite band gap of 1.7 eV. The great versatility of perovskite allows a facile modification of its band gap by changing its elemental composition. The engineered perovskite can be used for solar application provided that the Goldschmidt factor is between 0.9 and 1. In addition, a second limiting phenomena appears to be the halide ratio, as for bromide content above 20%, a segregation of phases can be observed . Taking these two limitations into consideration, the band gap of halide perovskite can hardly surpass 1.6 eV. A possible alternative route could be the substitution of a fraction of lead by tin as any perovskite with methyl ammonium, lead, tin, iodine and chlorine results in a stable photoactive perovskite.