Aurinka PV Group, together with Instituto de Enegía Solar (IES), Universidad Politécnica de Valencia (UPV) and the Center for Solar Energy Research and Applications (GÜNAM), will work in the Solar Era Net project named Cheer-Up (low Cost High EfficiEnt and Reliable Umg Pv cells).
The final scope of the CHEER-UP project is to enhance the potential performance of Upgraded Metallurgical Silicon (UMG) for multicrystalline solar cells, and demonstrate that UMG silicon is a competitive alternative for polysilicon, in terms of economics, environmental impact and energy budget. Particularly, this scope will be addressed in the frame of Passivated Emitter and Rear cell architecture (PERC) that incorporates Black Silicon texturization.
For that, different techniques are going to be explored:
1) P diffusion gettering (PDG) in combination with Low Thermal Annealings (LTA) and other defect engineering approaches, that permit to capture the excess of metals the UMG may have in comparison with polysilicon, improving the potential bulk quality of the silicon substrate.
2) PERC (or PERC+) will be the cell architecture used to assess the efficiency of the UMG wafers, as it is by far the most extended and profitable technique used in the market.
3) Black silicon, as the best texturization process used for multicrystalline wafers, will give the solar cells a higher efficiency and reduce the gap efficiency of multi against mono.
4) Passivation (hydrogenation) conveniently tailored to adapt to the thermal profiles used in P gettering and thermal treatments will be explored, and will also contribute to efficiency enhancement.
5) Light Induced Degradation (LID) and Light and elevated Temperature Induced Degradation (LeTID) affect more to multi than mono wafers. So, degradation recovery techniques will be researched to minimize the mentioned LID and LeTID phenomena.
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