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nandhutu

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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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