Edge defined growth

RWE Group SCHOTT AG Edge-defined Film Growth SunRoof FS SunRoof RS Kuramoto Co. Ltd. 

EDF Group UNISTAR NUCLEAR ENERGY LLC Edge-defined Film Growth SCHOTT SOLAR Edison International SOUTHERN CALIFORNIA EDISON COMPANY... 

A continuous monocrystalline sapphire (A1203) fibre has been prepared as single-crystal fibres by LaBelle and Mlavsky using a modified czochralski puller and radio frequency heating. The technique adopted in this method is called edge-defined film-fed growth (EFG) [18-22], Figure 3.4 shows a schematic of the EFG method. 

Edge defined, film-fed, growth process for making a single-crystal alumina fibre (reproduced by permission of Chapman Hall)56. 

Figure 6.11 Schematic of the edge-defined fihn-fed growth (EFG) method of making a single crystal alumina fiber.

This will be demonstrated for three typical examples representing the most important silicon ribbon growth processes the edge-defined film-fed growth and the string ribbon process where the crystallisation interface moves in line with the ribbon transport direction as typical representatives of type I, and the ribbon growth on substrate technique where the liquid-solid interface moves almost perpendicular to the ribbon transport direction as type II process. 

Edge-Defined Film-Fed Growth (Type I Technology)... 

Fig. 7.2. Schematic drawing of the edge-defined film-fed growth (EFG) technology as an example of a type I process. Liquid silicon is lifted by capillary forces through the die, where the silicon ribbon is pulled (left). Closed forms with 8 or 12 facets (side width 12.5 cm) are used for the shape of the foil in order to avoid edge effects...

Edge-Defined Film-Fed Growth (EFG) - A method for making sheets of polycrystalline silicon (for solar photovlotaic devices) in which molten silicon is drawn upward by capillary action through a mold. 

Saphikon Saphikon 100% AI2O3 3.96 single-crystal a-Al203 125 mono filament edge defined film- fed growth 470 3.5 9 developmental fibers... 

FIGURE 3-4 Fast fracture strength at temperature for commercial fibers based on silicon compounds and alumina. PP = polymer pyrolysis, SG = sol gel, SS = slurry spinning, EDFG = edge defined film growth, CVD = chemical vapor deposition. Source DiCarlo and Dutta, 1995. 

FIGURE 3-21 One-hour bend stress relaxation ratio for directionally solidified eutectic YAG/alumina fibers grown by edge-defined film growth (EFG), for polycrystalline alumina-based fibers, and for c-axis sapphire fibers. Source Morscher et al., 1995. 

Inviscid very low sapphire, other fibers updrawing >MP edge defined fiber growth ambient... 

Continuous single crystal fibers can be grown from inviscid melts by two relatively slow processes the edge defined film fed growth (EFG) process [13] and the laser heated float zone (LHFZ) or laser heated pedestal growth (LHPG) process [14]. Both offer growth rates of toO.3-0.7 mm/s [13-14]. 

Edge defined film fed growth (EFG) is a commercial process [13] that facilitates the fabrication of continuous void free single crystal oxide fibers (Figure 16) from tungsten or other growth orifices. 

Figure 16. Edge defined film fed growth process (schematic drawing). Redrawn from J. Monbleau, Single-crystal technology, Product Bulletin, Saphikon Inc., Milford, NH (1994).

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