CONTINUOUS PRODUCTION OF PHOTOVOLTAIC SILICON RIBBONS BY THE NEW PENDANT DROP GROWTH (PDG) METHOD
In this work major aspects of the new crystallization process "Pendant Drop Method" (PDG) for crystalline silicon ribbon-like strips have been investigated. Apparatus and procedure were significantly improved and theoretical considerations led to a stable process as well as the possibility of manufacturing strips thinner than the lip thickness. The study of materials provided an ideal crucible, which is made of graphite with a specific gravity of at least 1.8 and is internally lined with SiC or pyrocarbon. The crucible powder feeding system involving a vibrating bowl has also been markedly improved. A constant rate of output within +- 1.5% is obtained between 1 and 100 g/hr. The response of the crucible to a temperature adjustment is immediate. Ribbons up to 500 mm long and 50 mm wide have been manufactured at an extrusion rate of as much as 90 cm/hr. Actual cost estimates showed that ribbons could be produced at less than 500 FF/m**2. Subsequent research has to be carried out in the following areas : reduction of thickness, automation, study and control of ribbon cooling, deduction of drawing lip external wetting.
Bibliographic Reference: EUR 9864 EN (1985), MF, 123 P., BFR 300, BLOW-UP COPY BFR 615, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989124031900 / Last updated on: 1987-01-01
Available languages: en