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Memorias de investigación
Artículos en revistas:
Degradation of Ge subcells by thermal load during the growth of multijunction solar cells
Año:2017
Áreas de investigación
  • Células solares
Datos
Descripción
Germanium solar cells are used as bottom subcells in many multijunction solar cell designs. The question remains whether the thermal load originated by the growth of the upper layers of the multijunction solar cell structure affects the Ge subcell performance. Here, we report and analyze the performance degradation of the Ge subcell due to such thermal load in lattice?matched GaInP/Ga(In)As/Ge triple?junction solar cells. Specifically, we have detected a quantum efficiency loss in the wavelength region corresponding to the emitter layer (which accounts for up to 20% loss in equivalent JSC) and up to 55 mV loss in VOC of the Ge subcell as compared with analogous devices grown as single?junction Ge solar cells on the same type of substrates. We prove experimentally that there is no direct correlation between the loss in VOC and the doping level of the base. Our simulations show that both the JSC and VOC losses are consistent with a degradation of the minority carrier properties at the emitter, in particular at the initial nanometers of the emitter next to the emitter/window heterointerface. In addition, we also rule out the gradual emitter profile shape as the origin of the degradation observed. Our findings underscore the potential to obtain higher efficiencies in Ge?based multijunction solar cells if strategies to mitigate the impact of the thermal load are taken into consideration
Internacional
Si
JCR del ISI
Si
Título de la revista
Progress in Photovoltaics
ISSN
1062-7995
Factor de impacto JCR
7,365
Información de impacto
Datos JCR del año 2015
Volumen
DOI
10.1002/pip.294
Número de revista
Desde la página
102
Hasta la página
111
Mes
OCTUBRE
Ranking
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: Enrique Barrigón Montañés
  • Autor: Mario Ochoa Gómez (UPM)
  • Autor: Ivan Garcia Vara (UPM)
  • Autor: Laura Barrutia Poncela (UPM)
  • Autor: Ignacio Rey-Stolle Prado (UPM)
  • Autor: Carlos Algora Del Valle (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Semiconductores III-V
  • Centro o Instituto I+D+i: Instituto de Energía Solar
  • Departamento: Electrónica Física, Ingeniería Eléctrica y Física Aplicada
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