High-purity silicon for solar cell applications

Improved High‐Purity Arc‐Furnace Silicon for Solar Cells

“…considerations from this and previous work (3)(4)(5)9) suggest that there are probably three main contributions to impurities in the PMS. The first contribution is contamination from the materials of construction of the arc furnace and from the stoking and tapping operations.…”

“…The construction of the smaller furnace is similar to one of fixed-body design previously described (9), but incorporates the split-body design in addition. The larger furnace incorporates the split-body design (10), as shown in Fig.…”

“…The methodology of feedstock selection and the methods for cleaning the quartz and the pelletization of SiO~ and carbon black Carbon blacks Carbon electrodes" powders are described elsewhere (3,8,9). Two sources of (ppmw) Type I a Type IF Pure Impure lump quartz and two sources of granular quartz were evaluated.…”

“…SiO.2 and C feedstocks.--Impurity analyses of the principal SiO~ and C feedstocks evaluated in this work are shown in Tables I and II, respectively. The methodology of feedstock selection and the methods for cleaning the quartz and the pelletization of SiO~ and carbon black Carbon blacks Carbon electrodes" powders are described elsewhere (3,8,9). Two sources of (ppmw) III, were conducted using type I.…”

“…Submerged-arc-reduction furnace operation.--The selected C and SiO2 feedstocks, described above, were converted into PMS in two different single-phase, laboratorysize, one-electrode arc furnaces of split-body design having nominal 50 and 100 kW power ratings, respectively. The construction of the smaller furnace is similar to one of fixed-body design previously described (9), but incorporates the split-body design in addition. The larger furnace incorporates the split-body design (10), as shown in Fig.…”