Skip to main content
European Commission logo print header

Roll to Module processed Crystalline Silicon Thin-Films for higher than 20% efficient modules

Objectif

The current technologies to produce photovoltaic modules exhibit features, which prevent cost-reduction to below 0,5€/Wp:
- Sawing/Wafering and Module assembly is costly and material intensive for wafer solar cells
- Efficiency is comparatively low for classical thin-film solar cells (CdTe, CIS, a-Si/µc-Si, dye, organic).
One approach to avoid both disadvantages is the so-called crystalline Si thin-film lift-off approach, where thin c-Si layers are stripped from a silicon wafer. This approach has the potential to reach > 20% efficient solar cells, however handling issues stop quick progress so far.
The basic idea of the current project is to enable the use of lift-off films in a nearly handling-free approach, to avoid limitations by handling issues.
The technological realization has the following key features and steps:
- Continuous separation of a very thin (< 10 µm) c-Si foil from the circumference of a monocrystalline silicon ingot
- Attachment to a high-temperature stable substrate of large area (e.g. graphite, Sintered Silicon, or ceramics), which can also serve as module back side.
- High-temperature re-organisation of the silicon foil followed by in-situ epitaxial thickening (~40 µm base thickness) in an in-line chemical vapour deposition reactor, including pn-junction formation
- Processing of high-efficiency solar cells and formation of integrated interconnected high-voltage modules
- Encapsulating into a module (glass / encapsulant only if needed)
The resulting module to be demonstrated in R2M-Si has a cost potential around 0.55 €/Wp, at 18% module efficiency and thus low Balance-of-System cost. Future enhanced R2M-Si modules can exceed even 20% efficiency, at costs below 0.5 €/Wp.
The project shall demonstrate the feasibility of the most critical process steps like continuous layer detachment, bonding to a carrier substrate, high-quality epitaxy, handling-free solar cell processing and module integration. As a deliverable, a mini module of higher than 18% efficiency shall be prepared.

Appel à propositions

FP7-ENERGY-2010-FET
Voir d’autres projets de cet appel

Coordinateur

FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG EV
Adresse
Hansastrasse 27c
80686 Munchen
Allemagne

Voir sur la carte

Région
Bayern Oberbayern München, Kreisfreie Stadt
Type d’activité
Research Organisations
Contact administratif
Maximilian Steiert (Mr.)
Liens
Contribution de l’UE
Aucune donnée

Participants (6)