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Bücher Englische Bücher Sachbücher Natur & Technik Laser processing for the integrated series connection of thin-film silicon solar cells
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Laser processing for the integrated series connection of thin-film silicon solar cells
Bugra Turan (Broschiert, Englisch)
Optischer Zustand
Beschreibung
The integrated series connection of solar cells is an essential aspect for thin-film photovoltaic
technology. With a series connection a high output voltage of the module is achieved while the
output current is kept low. Thus, Ohmic losses in the contact materials are kept low as well.
In thin-film silicon solar technology the steps to create the interconnection are commonly
done by laser ablation… integrated in-between the depositions of the solar cell layer materials. In
three steps laser scribing is used to selectively remove layers locally in the formof lines across
the module substrate. In a first step the front-contact is removed for electrical insulation and
cell stripe definition. Afterwards, the absorber is removed locally exposing the front-contact
beneath. Finally, the interconnection is formed when the back-contact is removed locally as
well.
The area that is needed for the interconnection of two neighboring cells is no longer active for
current generation. Depending on the technology 5–10% of active area is lost. The reduction
of this area holds an attractive potential for an increase of the module efficiency. The topic
of this thesis is the investigation of the lower geometrical limits for the dead area reduction
for substrate side laser processing of thin-film silicon solar cells. It is well-known that the
interconnection and the laser processes can have an impact on the performance of the solar
module. Therefore, the characterization of the impact on the performance is of special importance
when laser processes are used that are capable of generating a reduced interconnection
width.
P1: for the front-contact insulation process it was found out that the scribe quality strongly
depends on the used laser wavelength. Ablation mechanisms that are driven by material phase
changes (scribing with 532 nmor 1064 nm) can lead to smoother scribe edges compared to
mechanisms dominated by stress-induced removal (355nm) where non-uniformrip-off at the
edges occurs.
However, in certain processing regimes, strong ablation debris redeposition in direct vicinity
of the P1 scribe is observed when small beam spot radii (<10m) are used. Such redeposition
has a severe impact on the solar cell performance in this region. With proper wet-chemical
cleaning the amount of redeposited debris on the front-contact and the negative impact on
the solar module can be minimized.
Parasitic shunting of two neighboring cell stripes by deposition of absorber material into the
P1 scribe increases when the scribe width is reduced. Measurements show that the overall
magnitude of the shunt is in a value range that impact on the solar module is negligible for
commonly used cell topologies Dieses Produkt haben wir gerade leider nicht auf Lager.
Handgeprüfte Gebrauchtware
Bis zu 50 % günstiger als neu
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Technische Daten
Erscheinungsdatum
26.02.2016
Sprache
Englisch
EAN
9783958061194
Herausgeber
Forschungszentrum Jülich
Serien- oder Bandtitel
Schriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment
Sonderedition
Nein
Autor
Bugra Turan
Seitenanzahl
188
Einbandart
Broschiert
Bandzählung
306
Schlagwörter
Solar cells, Thin film, Photovoltaic technology
Thema-Inhalt
TH - Energietechnik, Elektrotechnik und Energiemaschinenbau
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