Title:
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Influence of wavelength on laser doping and laser-fired contact processes for c-Si solar cells
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Author:
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Molpeceres Alvarez, Carlos; Sanchez Aniorte, Maria Isabel; Morales, Miguel; Muñoz, David; Martín García, Isidro; Ortega Villasclaras, Pablo Rafael; Colina Brito, Mónica Alejandra; Voz Sánchez, Cristóbal; Alcubilla González, Ramón
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. MNT - Grup de Recerca en Micro i Nanotecnologies |
Abstract:
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This work investigates the influence of
the
laser
wavelength on laser doping (LD) and laser
-
fired contact (LFC)
formation
in solar cell structures
. We compare the results obtained using the three first harmonics (corresponding to
wavelengths of
1064
nm, 532 nm and 355 nm) of fully commercial
solid state
laser sources with pulse width in the ns
range. The discussion is based on the impact on the morphology and electrical characteristics of test structures.
In the case
of
LFC the study includes th
e influence of different passivation layers and the assessment of the process
quality through electrical resistance measurements of an alumin
i
um single LFC point for the different wavelengths.
Values for the normalized LFC resistance far below 1
.0
m
Ω
cm
2
have been obtained, with better
results
at
s
horter
wavelen
g
ths.
To assess the influence of the laser wavelength on LD we have created n+ regions into p
-
type c
-
Si wafers
, using a dry
LD approach
to
define
punctual emitters.
J
-
V
characteristics show exponen
tial trends at mid
-
injection for a broad
parametric window in all wavelengths,
with local ideality factors well below 1.5.
In bot
h processes the best results have
been obtained using green (532 nm) and
, specially,
UV (355 nm)
.
This indicates
that to minim
ize the thermal damage in the material is a clear requisite to obtain th
e best electrical performance, thus
indicating that UV laser shows better potential to be used in high efficiency solar cells. |
Abstract:
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Peer Reviewed |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria electrònica::Optoelectrònica::Làser -Àrees temàtiques de la UPC::Energies::Energia solar fotovoltaica::Cèl·lules solars -Solar cells -Lasers -Cèl·lules solars -Làsers |
Rights:
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Document type:
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Article - Published version Conference Object |
Published by:
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SPIE
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