Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Optimization of laser-firing processes for silicon-heterojunction solar-cell back contacts
Year:2011
Research Areas
  • Engineering
Information
Abstract
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.
International
Si
JCR
Si
Title
APPLIED SURFACE SCIENCE
ISBN
0169-4332
Impact factor JCR
1,616
Impact info
Volume
10.1016/j.apsusc.2011.09.108
Journal number
From page
33
To page
35
Month
ENERO
Ranking
Participants
  • Autor: Maria Isabel Sanchez Aniorte (UPM)
  • Autor: Miguel Morales Furio (UPM)
  • Autor: Carlos Luis Molpeceres Alvarez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Departamento: Física Aplicada a la Ingeniería Industrial
S2i 2019 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)