Iron chalcogenide photovoltaic absorbers - Altschul, Emmeline.; Jieratum, Vorranutch.; Keszler, Douglas A.; Kykyneshi, Robert.; Lany, Stephan.; Pelatt, Brian.; Platt, Heather A. S.; Ravichandran, Ram.; Wager, John F.; Yu, Liping.; Zunger, Alex.