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The dimensions and quality of the screen printed lines are determined by the screen definitions, the printing machine parameters, the paste characteristics and the cell surface characteristics. For solar cell processing much of the technology is inherited and adapted from the PCB industry [1]. The technological status of screen development and printing machine parameters are not limiting factors. For a dedicated printing machine operator it is feasible to combine the different, and generally contradictory, parameters and come to optimized results. The paste characteristics, however, are the least controlled by the user, and yet they have an enormous impact on not only the printing behaviour, quality and final line definition, but also on the fired film density and optimum contact of the particles with the silicon. A limiting factor is the availability of pastes with optimal printing characteristics. Up to now commercial solar pastes have been developed for their contacting and electrical behaviour, rather than to accommodate present printing requirements. |
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