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Standard Practice for Evaluation of Granular Polysilicon by Meter-Zoner Spectroscopies
Automaticky preložený názov:
Štandardná prax pre hodnotenie granulovaných polysilikónu podľa Meter - Zoner spektroskopia
NORMA vydaná dňa 10.1.2002
Označenie normy: ASTM F1708-96
Poznámka: NEPLATNÁ
Dátum vydania normy: 10.1.2002
Kód tovaru: NS-51254
Počet strán: 5
Približná hmotnosť: 15 g (0.03 libier)
Krajina: Americká technická norma
Kategória: Technické normy ASTM
Keywords:
granular polysilicon, polycrystalline silicon, polysilicon consolidation, polysilicon evaluation, polysilicon impurities, ICS Number Code 71.040.50 (Physicochemical methods of analysis)
1. Scope |
This standard was transferred to SEMI (www.semi.org) May 2003 1.1 This practice describes a procedure to consolidate granular polysilicon into a solid rod and then to convert the polysilicon rod into a single crystal by a float-zone technique. The resultant single crystal ingot is used for the determination of trace impurities in the polysilicon. These impurities are acceptor and donor components (usually boron, aluminum, phosphorus, arsenic, and antimony) as well as substitutional carbon. 1.2 The useful range of impurity concentration covered by this practice is 0.002 to 100 parts per billion atomic (ppba) for acceptor and donor impurities, and 0.03 to 5 parts per million atomic (ppma) for carbon. The acceptor and donor impurities are analyzed in a slice taken from the single crystal ingot by photoluminescence or infrared spectroscopies. The carbon impurity is determined by analysis of a slice by infrared spectroscopy. 1.3 This practice is applicable only to evaluation of polysilicon granules as produced by thermal deposition of silane, or one of the chlorosilanes, onto high purity seeds of polysilicon in a continuous fluid bed reactor. The granules are near spherical in shape and range in size from 200 to 2500 μm with a mean size of about 900 μm. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Section 9 and in 12.1.1. |
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