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Memorias de investigación
Artículos en revistas:
Impact of extended contact cofiring on multicrystalline silicon solar cell parameters
Año:2017
Áreas de investigación
  • Silicio,
  • Células solares,
  • Tecnología de dispositivos para ingeniería eléctrica y electrónica
Datos
Descripción
During the temperature spike of the contact cofiring step in a solar cell process, it has been shown that the concentration of lifetime-killer dissolved metallic impurities increases, while adding an annealing after the spike getters most of the dissolved impurities toward the phosphorus emitter, where they are less detrimental. The contact cofiring temperature profile, including the after-spike annealing, has been called extended contact cofiring, and it has also been proposed as a means to decrease the emitter saturation current density of highly doped emitters, thus benefiting a wide range of materials in terms of detrimental impurity content. The aim of the present work is to determine the effect of performing this additional annealing on contact quality and solar cell performance, looking for an optimal temperature profile for reduction of bulk and emitter recombination without affecting contact quality. It presents the effect of the extended cofiring step on fill factor, series resistance, and contact resistance of solar cells manufactured with different extended cofiring temperature profiles. Fill factor decreases when extended cofiring is performed. Series resistance and contact resistance increase during annealing, and this happens more dramatically when the temperature peak is decreased. Scanning electron microscopic images show silver crystallites in contact with silver bulk before the annealing that allow a direct current path, and silver crystallites totally surrounded by glass layer (>100 nm thick) after annealing. Glass layer redistribution and thickening at low temperatures at the semiconductor-metal interface can be related to the series resistance increase. Degradation of series resistance during the temperature spike, when it is below the optimum one, can also be attributed to an incomplete silicon nitride etching and silver crystallite formation. To make full use of the beneficial effects of annealing, screen-printing metallic paste development supporting lower temperatures without a thick glass layer growth is needed.
Internacional
Si
JCR del ISI
Si
Título de la revista
Ieee Journal of Photovoltaics
ISSN
2156-3381
Factor de impacto JCR
3,712
Información de impacto
Volumen
7
DOI
10.1109/jphotov.2016.2621342
Número de revista
1
Desde la página
91
Hasta la página
96
Mes
SIN MES
Ranking
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Participantes
  • Autor: Ana Peral Boiza (UPM)
  • Autor: A. Dastgheib-Shirazi
  • Autor: V. Fano
  • Autor: J.C. Jimeno
  • Autor: G. Hahn
  • Autor: Carlos del Cañizo Nadal (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Centro o Instituto I+D+i: Instituto de Energía Solar
  • Departamento: Electrónica Física, Ingeniería Eléctrica y Física Aplicada
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