A puzzling solar cell structure: an exercise to get insight on intermediate band solar cells

Martí Vega, Antonio; Antolín Fernández, Elisa; García-Linares Fontes, Pablo; Ramiro Gonzalez, Iñigo; López Estrada, Esther; Tobías Galicia, Ignacio y Luque López, Antonio (2013). A puzzling solar cell structure: an exercise to get insight on intermediate band solar cells. En: "39th Photovoltaic Specialists Conference (PVSC)", 16/06/2013 - 21/06/2013, Tampa, Florida, EE.UU. pp. 1069-1073.

Descripción

Título: A puzzling solar cell structure: an exercise to get insight on intermediate band solar cells
Autor/es:
  • Martí Vega, Antonio
  • Antolín Fernández, Elisa
  • García-Linares Fontes, Pablo
  • Ramiro Gonzalez, Iñigo
  • López Estrada, Esther
  • Tobías Galicia, Ignacio
  • Luque López, Antonio
Tipo de Documento: Ponencia en Congreso o Jornada (Artículo)
Título del Evento: 39th Photovoltaic Specialists Conference (PVSC)
Fechas del Evento: 16/06/2013 - 21/06/2013
Lugar del Evento: Tampa, Florida, EE.UU
Título del Libro: 39th Photovoltaic Specialists Conference (PVSC)
Fecha: 2013
Materias:
Palabras Clave Informales: intermediate band solar cell, quantum efficiency model, solar cell modeling
Escuela: E.T.S.I. Telecomunicación (UPM)
Departamento: Electrónica Física
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

We introduce one trivial but puzzling solar cell structure. It consists of a high bandgap pn junction (top cell) grown on a substrate of lower bandgap. Let us assume, for example, that the bandgap of the top cell is 1.85 eV (Al 0.3Ga 0.7As) and the bandgap of the substrate is 1.42 eV (GaAs). Is the open-circuit of the top cell limited to 1.42 V or to 1.85 V? If the answer is ldquo1.85 Vrdquo we could then make the mind experiment in which we illuminate the cell with 1.5 eV photons (notice these photons would only be absorbed in the substrate). If we admit that these photons can generate photocurrent, then because we have also admitted that the voltage is limited to 1.85 V, it might be possible that the electron-hole pairs generated by these photons were extracted at 1.6 V for example. However, if we do so, the principles of thermodynamics could be violated because we would be extracting more energy from the photon than the energy it initially had. How can we then solve this puzzle?

Más información

ID de Registro: 26766
Identificador DC: http://oa.upm.es/26766/
Identificador OAI: oai:oa.upm.es:26766
URL Oficial: http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6744325
Depositado por: Memoria Investigacion
Depositado el: 25 Jun 2014 17:38
Ultima Modificación: 22 Sep 2014 11:42
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