to achieve useful levels of voltage and current, and putting them in a sturdy frame complete with positive and negative terminals. CHAPTER 3:-MANUFACTURING TECHNOLOGY & PROCESS OF SOLAR CELL 3.1 STEP 1 - PURIFICATION OF SILICON: The basic component of a solar cell is intrinsic silicon, which is not pure in its natural state. To make solar cells, the raw materials—silicon dioxide of either quartzite gravel or crushed quartz—are first placed into an electric arc furnace, where a carbon arc is applied to release the oxygen. A Graphite and Thermal insulator trap the heat and maintain the furnace at required temperature for gangue (impurity) to form a slag. The products are carbon dioxide and molten silicon. Silicon ingot is pulled down from the molten silicon using seed silicon crystallization and floating zone technique. Passing impure silicon in same direction several times that separates impurities- and impure end is later removed. This process yields silicon with one percent impurity, useful in many industries but not the solar cell industry. At this point, the silicon is still not pure enough to be used for solar cells and requires further purification. Pure silicon is derived from such silicon dioxides as quartzite gravel (the purest silica) or crushed quartz.
to achieve useful levels of voltage and current, and putting them in a sturdy frame complete with positive and negative terminals. CHAPTER 3:-MANUFACTURING TECHNOLOGY & PROCESS OF SOLAR CELL 3.1 STEP 1 - PURIFICATION OF SILICON: The basic component of a solar cell is intrinsic silicon, which is not pure in its natural state. To make solar cells, the raw materials—silicon dioxide of either quartzite gravel or crushed quartz—are first placed into an electric arc furnace, where a carbon arc is applied to release the oxygen. A Graphite and Thermal insulator trap the heat and maintain the furnace at required temperature for gangue (impurity) to form a slag. The products are carbon dioxide and molten silicon. Silicon ingot is pulled down from the molten silicon using seed silicon crystallization and floating zone technique. Passing impure silicon in same direction several times that separates impurities- and impure end is later removed. This process yields silicon with one percent impurity, useful in many industries but not the solar cell industry. At this point, the silicon is still not pure enough to be used for solar cells and requires further purification. Pure silicon is derived from such silicon dioxides as quartzite gravel (the purest silica) or crushed quartz.
302566747-Solar-tree.docx