Event DetailsEvent Dates: Tuesday, August 20, 2013 - 10:00amSeminar Location: JILA AuditoriumSpeaker Name(s): Lazaro PadilhaSpeaker Affiliation(s): Universidade Estadual de Campinas Seminar Type/SubjectScientific Seminar Type: JILA ColloquiumEvent Details & Abstract: The original proposal of carrier multiplication (CM), the process in which one absorbed photon excites more than one electron-hole pair, in quantum-confined nanostructures by Nozik (2002), and subsequent observation by Schaller & Klimov (2004), has stimulated much experimental and theoretical research in this field. A single junction solar cell, taking fully advantage of CM would have efficiency of ~ 42 %, higher than the maximum 31 % expected by the Shockley-Queisser limit. However, contrary to the initial thoughts, CM enhancement in semiconductor nanocrystals (NCs) is still not strong enough to make real impact in solar power conversion. Here I present the recent progress in understanding the CM process NCs, discussing the role of their size, composition, and shape to this process. I will discuss possible pathways to further enhance CM in NCs to achieve desirable efficiency in photovoltaic devices.