Experimental and theoretical study on optimizing CaxBa1−xSnO3 perovskite materials as photoanode of dye-sensitized solar cells

•Ca doped BaSnO3 (CaxBa1−xSnO3) perovskite as a photoanode in dye-sensitized solar cells (DSSC).•Ca0.1Ba0.9SnO3 has better efficiency with the JSC of 4.62 mA cm−2 and VOC of 0.726 V under full sunlight illumination.•The conduction band minimum of Ca0.1Ba0.9SnO3 is slightly lower than LUMO of N719 dye than other higher compositions.•This provides facile electron transfer from dye to this perovskite material after shining the light thereby increasing efficiency.