Objective
A basic process flow of a cost-effective Si solar cell process looks as follows:
- Saw damage removal
- Texturing
- Emitter diffusion
- Emitter passivation
- ARC-deposition
- Backside and frontside contacting by means of screenprinting and firing of the paste.
The properties of porous Si (or a modified form) can be used advantageously on three places in this generic process flow. It acts as a replacement for the texturization step and the ease of adapting the refractive index of this material make it an attractive method to achieve an ARC-effect. If, in addition, it also proves to have good surface passivation properties, the introduction of porous Si in this generic process will automatically lead to a selective emitter process, where the emitter in between the fingers has a lower surface concentration. This will improve the blue response of the cell. This would allow to replace three steps in the realization of the cell by one low-temperature treatment.
Since there are two competing technologies for the formation of porous Si (electrochemical and chemical), the project will study both at the start of the project, since the existing knowledge does not allow to make a final choice yet. This leads to two parallel roads, where the electrochemical route will be headed by IMEC in collaboration with CNRS-LPSB. The chemical etching route will be headed by ISE in collaboration with UAM. After the choice of the most suited technique, the industrial partners ASE and Merck will take the lead in the development effort for introducing the chosen technique in a cost-effective process and for the assessing the reliability and stability of porous Si on cell level. Once this basic knowledge is established for porous Si on multicrystalline substrates, the consortium will focus on introducing this material in a cost-effective process. New questions will have to be dealt with at this level: how will the porous Si behave after encapsulation (optical properties, stability) and what are the costs and implications of handling the HF-containing bath, needed for the formation of porous Si.
Fields of science (EuroSciVoc)
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Programme(s)
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Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
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Funding Scheme
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
3001 Leuven
Belgium
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.