 Organometal parafskite materials are promising candidates for solar energy conversion due to their high efficiency and stability. Electronic structure calculations were conducted on 240 parafskites composed of CS, CH3NH3, NHC, NH2, II as a cation, SN and Pb as bion, and a combination of Cl, Br, and I as anions. The results showed that the band gap increased with increasing electronegativity of the constituents and decreased with increasing lattice constant. This suggests that the band gap can be tuned by varying the composition and structure of the material. This article was authored by Ivano E. Castelli, Juan Maria Garcia-Lastra, Christian S. Tejisen and others.