Solar-Grade Silicon from Metallurgical-Grade Silicon Via Iodine Chemical Vapor Transport Purification: Preprint Metadata

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Title

  • Main Title Solar-Grade Silicon from Metallurgical-Grade Silicon Via Iodine Chemical Vapor Transport Purification: Preprint

Creator

  • Author: Ciszek, T. F.
    Creator Type: Personal
  • Author: Wang, T. H.
    Creator Type: Personal
  • Author: Page, M. R.
    Creator Type: Personal
  • Author: Bauer, R. E.
    Creator Type: Personal
  • Author: Landry, M. D.
    Creator Type: Personal

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: US Department of Energy (United States)

Publisher

  • Name: National Renewable Energy Laboratory (U.S.)
    Place of Publication: Golden, Colorado
    Additional Info: National Renewable Energy Lab., Golden, CO (United States)

Date

  • Creation: 2002-05-01

Language

  • English

Description

  • Content Description: This conference paper describes the atmospheric-pressure in an ''open'' reactor, SiI2 transfers from a hot (>1100C) Si source to a cooler (>750C) Si substrate and decomposes easily via 2SiI2 Si+ SiI4 with up to 5?m/min deposition rate. SiI4 returns to cyclically transport more Si. When the source is metallurgical-grade Si, impurities can be effectively removed by three mechanisms: (1) differing free energies of formation in forming silicon and impurity iodides; (2) distillation; and (3) differing standard free energies of formation during deposition. Distillation has been previously reported. Here, we focused on mechanisms (1) and (3). We made feedstock, analyzed the impurity levels, grew Czochralski single crystals, and evaluated crystal and photovoltaic properties. Cell efficiencies of 9.5% were obtained. Incorporating distillation (step 2) should increase this to a viable level.
  • Physical Description: 7 pages

Subject

  • Keyword: Pv
  • Keyword: Quantum Efficiency
  • STI Subject Categories: 36 Materials Science
  • Keyword: Impurities
  • Keyword: Crystal Growth
  • Keyword: Deposition
  • Keyword: Thin-Layer Si
  • Keyword: Refining/Sublimation
  • Keyword: Sog-Si Feedstock
  • Keyword: Iodides
  • Keyword: Purification
  • Keyword: Heat Exchangers
  • Keyword: Monocrystals
  • Keyword: Substrates
  • STI Subject Categories: 14 Solar Energy
  • Keyword: Iodine
  • Keyword: Atmospheric Pressure
  • Keyword: Atmospheric-Pressure
  • Keyword: Distillation
  • Keyword: Transport
  • Keyword: Solar Grade Silicon
  • Keyword: Solar Energy Pv
  • Keyword: Thermo-Decomposition
  • Keyword: Solar Energy - Photovoltaics
  • Keyword: Silicon
  • Keyword: Chemical Vapor Transport Purification

Source

  • Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 May 2002

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: NREL/CP-520-31443
  • Grant Number: AC36-99-GO10337
  • Office of Scientific & Technical Information Report Number: 15006973
  • Archival Resource Key: ark:/67531/metadc1404751
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