S1 Supporting Information DirectIndirect Nature of the Bandgap in LeadFree Perovskite Nanocrystals Yuhai Zhang, † Jun Yin, † Manas R. Parida, † Ghada H. Ahmed, † Jun Pan, † Osman M. Bakr, † JeanLuc Brédas, †# Omar F. Mohammed *,† † King Abdullah University of Science and Technology, KAUST Solar Center, Division of Physical Sciences and Engineering, Thuwal 239556900, Kingdom of Saudi Arabia # New permanent address: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 303320400, USA   omar.abdelsaboor@kaust.edu.sa