Nanotechnology for more efficient photovoltaics: the quantum dot intermediate band solar cell

Luque López, Antonio (2011). Nanotechnology for more efficient photovoltaics: the quantum dot intermediate band solar cell. En: "Trends in Nanoapplications Energy 2011, TNA 2011", 11/04/2011 - 13/04/2011, Bilbao, España.

Descripción

Título: Nanotechnology for more efficient photovoltaics: the quantum dot intermediate band solar cell
Autor/es:
  • Luque López, Antonio
Tipo de Documento: Ponencia en Congreso o Jornada (Artículo)
Título del Evento: Trends in Nanoapplications Energy 2011, TNA 2011
Fechas del Evento: 11/04/2011 - 13/04/2011
Lugar del Evento: Bilbao, España
Título del Libro: Proceedings of the Trends in Nanoapplications Energy 2011, TNA 2011
Fecha: 2011
Materias:
Escuela: E.T.S.I. Telecomunicación (UPM)
Departamento: Electrónica Física
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

The intermediate band solar cell [1] has been proposed as a concept able to substantially enhance the efficiency limit of an ordinary single junction solar cell. If a band permitted for electrons is inserted within the forbidden band of a semiconductor then a novel path for photo generation is open: electron hole pairs may be formed by the successive absorption of two sub band gap photons using the intermediate band (IB) as a stepping stone. While the increase of the photovoltaic (PV) current is not a big achievement —it suffices to reduce the band gap— the achievement of this extra current at high voltage is the key of the IB concept. In ordinary cells the voltage is limited by the band gap so that reducing it would also reduce the band gap. In the intermediate band solar cell the high voltage is produced when the IB is permitted to have a Quasi Fermi Level (QFL) different from those of the Conduction Band (CB) and the Valence Band (VB). For it the cell must be properly isolated from the external contacts, which is achieved by putting the IB material between two n- and p-type ordinary semiconductors [2]. Efficiency thermodynamic limit of 63% is obtained for the IB solar cell1 vs. the 40% obtained [3] for ordinary single junction solar cells. Detailed information about the IB solar cells can be found elsewhere [4].

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Depositado el: 19 Sep 2012 12:34
Ultima Modificación: 21 Abr 2016 11:10
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