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The aim of the research is a deep survey of all parameters related to the manufacturing process of polycristalline photovoltaic solar cells in order to maximize the photovoltaic efficiency at a minimum cost. The background is the process of monocrystalline solar cells. The investigations have included the following items : 1) Study of the correlation between polycristalline defects and photovoltaic performances 2) Wafering and sawing damages according to various slicing machines. 3) Chemical 4) Diffusion processes. 5) Front metallization with electrodeless nickel plating. 6) Handling and mechanical stability. 7) Hot spot effect. 8) Overall photovoltaic efficiency in production. 9) Economic effect. 10) Characterization of solar grade polysilicon. The main results achieved are : - By adding all the improvements investigated within the frame of this contract, the photovoltaic efficiency of polycrystalline solar cells can be improve from 9 % to 10 %. - The chemical forecast is that the polycrystalline cell with supersede the single crystalline cell around the year 1983. - By using a specially clean furnace and pure reactants it is possible to get a solar grade silicon from which we can produce solar cells showing a 4.5 % photovoltaic efficiency. It is a promising achievement for such a preliminary experiment.

Additional information

Bibliographic Reference: EUR 9944 EN (1985) MF, 52 P., BFR 150, BLOW-UP COPYL BFR 260, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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