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Calculated band-gaps at various levels of theory for MASnI3 (a) and MAPbI3 (b) perovskites. (c) Maximum short-circuit photocurrent density which can be extracted from a solar cell employing MASnI3 and MAPbI3, as obtained by integration of ASTM G173-03 reference spectrum with the assumption of 100% IPCE above the band-gap. Experimental data from Ref. 1, 30 and 9.
