Memorias de investigación
Ponencias en congresos:
A puzzling solar cell structure: an exercise to get insight on intermediate band solar cells
Año:2013
Áreas de investigación
  • Células solares
Datos
Descripción
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?
Internacional
Si
Nombre congreso
39th IEEE Photovoltaic Specialists Conference
Tipo de participación
960
Lugar del congreso
Tampa, FL, USA
Revisores
Si
ISBN o ISSN
978-1-4799-3299-3
DOI
Fecha inicio congreso
16/06/2013
Fecha fin congreso
21/06/2013
Desde la página
1069
Hasta la página
1073
Título de las actas
Proceedings 39th IEEE PVSC
Esta actividad pertenece a memorias de investigación
Participantes
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Silicio y Nuevos Conceptos para Células Solares
  • Centro o Instituto I+D+i: Instituto de Energía Solar
  • Departamento: Electrónica Física