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Carrier Multiplication in Semiconductor Nanocrystals: What Really Matters?

Event Details

Event Dates: 

Tuesday, August 20, 2013 - 10:00am

Seminar Location: 

  • JILA Auditorium

Speaker Name(s): 

Lazaro Padilha

Speaker Affiliation(s): 

Universidade Estadual de Campinas
Seminar Type/Subject

Scientific Seminar Type: 

  • JILA Colloquium

Event 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.