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The contact performance of seed-layer printed, fired and plated (SFP) contacts were studied on solar cells with different emitter sheet resistivities. For the seed layer of the SFP-contacts a special metal ink called SISC (seed layer ink for the metallization of solar cells), developed and fabricated at Fraunhofer ISE to contact lowly doped emitters was used. The doping profile and the surface concentration...
This paper presents an overview of significant crystallisation results obtained with purified metallurgical grade silicon in the framework of the French Photosil project. Especially we show that in case of a high boron concentration in the feedstock (>2.1017 cm-3), the higher the compensation level is, the higher the solar cells efficiency will be. Several ingots were crystallised with different...
Optimized chemical structure was proposed for boron-doped Si quantum dots superlattices. Boron-doped Si quantum dots superlattices were then synthesized by a co-sputtering technique, and characterized for their promising application in all-Si tandem solar cells. The formation of Si quantum dots was confirmed by transmission electron microscopy. The effect of boron dopant concentration on the Si crystallization...
In order to investigate our new LFC process for the formation of local contacts on a dielectrically passivated rear surface, we have analyzed n/sup +/np/sup +/ structures processed identically to the standard n/sup +/pp/sup +/ cells except for the doping type of the base material. For these devices the p/sup +/-emitter is formed point-like at the rear surface by Al-alloying during the LFC process...
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