Memorias de investigación
Artículos en revistas:
Optimization of laser-firing processes for silicon-heterojunction solar-cell back contacts
Año:2011
Áreas de investigación
  • Ingenierías
Datos
Descripción
One of the key steps to achieve high efficiencies in amorphous/crystalline silicon photovoltaic structures is to design low-ohmic-resistance back contacts with good passivation in the rear part of the cell. A well known approach to achieve this goal is to use laser-fired contact (LFC) processes in which a metal layer is fired through the dielectric to define good contacts with the semiconductor. However, and despite the fact that this approach has demonstrated to be extremely successful, there is still enough room for process improvement with an appropriate optimization. In this paper, a study focused on the optimal adjustment of the irradiation parameters to produce laser-fired contacts in a-Si:H/c-Si heterojunction solar cells is presented. We used samples consisting of crystalline-silicon (c-Si) wafers together with a passivation layer of intrinsic hydrogenated amorphous silicon (a-Si:H(i)) deposited by plasma-enhanced chemical deposition (PECVD). Then, an aluminum layer was evaporated on either side, the thickness of this layer was varied from 0.2 to 1µm in order to identify the optimal amount of Al that is required to create an appropriate contact. A q-switched Nd:YVO4 laser source, ¿ = 532 nm, was used to locally fire the aluminum through the thin a-Si:H(i)-layers to form the LFC contact. The effects of different irradiation parameters, such as number of pulses, laser power, and repetition rate were analyzed using a comprehensive morphological and electrical characterization.
Internacional
Si
JCR del ISI
Si
Título de la revista
APPLIED SURFACE SCIENCE
ISSN
0169-4332
Factor de impacto JCR
1,616
Información de impacto
Volumen
DOI
10.1016/j.apsusc.2011.09.108
Número de revista
Desde la página
33
Hasta la página
35
Mes
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  • Creador: Departamento: Física Aplicada a la Ingeniería Industrial