Download PDF by C.P. Khattak, K.V. Ravi: Silicon Processing for Photovoltaics I

By C.P. Khattak, K.V. Ravi

ISBN-10: 0444868100

ISBN-13: 9780444868107

ISBN-10: 0444869336

ISBN-13: 9780444869333

The processing of semiconductor silicon for production comparatively cheap photovoltaic items has been a box of accelerating job during the last decade. various equipment for decreasing the producing bills of uncooked fabrics, crystals, units and finish items were less than improvement all over the world. Up in the past accomplished studies of key technical advancements within the box haven't been on hand in any unmarried handy resource. This quantity hopes to rectify this via providing a chain of intensive studies of significant themes of curiosity written by way of specialists and practitioners within the field.

The quantity is restricted to silicon and no papers on non silicon semiconductors are integrated. themes lined comprise: polycrystalline silicon know-how specifications for photovoltaic functions; Czochralski know-how; development of formed crystals at once from the soften; beam processing applied sciences which promise inexpensive manufacture of sun cells, and, amorphous silicon technology.

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X y s r 2 SI (MG) REACTOR SIF 2 SIF 4 POLYMERIZER/ (SIF ) 2 DEPOLYMERIZER SIF X POLYMER CRYSTALLIZATION DECOMPOSER 4 CONDENSER SIF Fig. 16. 4 MAKE-UP Block diagram of the SiF -SiF transport process for the production of solar grade silicon. R. 5. Bromine and iodine based processes The equilibrium behavior of the bromine-silicon-hydrogen, iodine-silicon-hydrogen, and chlorine-silicon-hydrogen systems have been investigated by Hunt and Sirtl (1972a, b). The thermal stability of the SiHX compounds are found to be in the order, SiHCl > SiHBr > SiHI .

1982) for a 10% SiH concentration in hydrogen for a decomposition temperature of 652°C. Pilot plant operation for demonstrating silane process technology and fluidized bed decomposer operation is scheduled for 1983. Announcement also has 4 Solar grade silicon LIGHT WASTE HEAVY 33 WASTE HYDROGENATION OF S I C L CATALYTIC IMPURITY 4 REDISTRIBUTION DISTILLATION FLUIDIZED BED OF HSICL SEPARATION REACTOR Η 2 SICL 2 HSICLg SICL. HSICLg SICL Η g S I C L g. FLUIDIZED BED DECOMPOSITION HSICLg. S ICL CRYOGENIC DISTILLATION 4 CATALYTIC REDISTRIBUTION DISTILLATION HjSN REACTOR Fig.

Installation of a 'solar scale plant' and relaxed specification on material form and purity would further accelerate price reductions. The continued development of alternative production processes will maintain a downward pressure on the price of polycrystalline silicon. A number of potentially low cost processes have been identified. Laboratory investigations have resulted in the preparation of material with intermediate product purity when compared to metallurgical grade and semiconductor grade silicon.

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Silicon Processing for Photovoltaics I by C.P. Khattak, K.V. Ravi

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