Seven Excitons at a Cost of One: Redefining the Limits for Conversion Efficiency of Photons into Charge Carriers Schaller, Richard D. ; Sykora, Milan ; Pietryga, Jeffrey M. ; Klimov, Victor I. Abstract Publication: Nano Letters Pub Date: March 2006 DOI: 10.1021/nl052276g Bibcode: 2006NanoL...6..424S