Journal article
Characterization of granular silicon, powders, and agglomerates from a fluidized bed reactor
Journal of materials science, Vol.47(6), pp.2583-2590
03/2012
Handle:
https://hdl.handle.net/2376/106666
Abstract
Growth of polycrystalline silicon from fluidized bed reactors (FBR) produces two general types of silicon products: granular material (diameters on the order of mm) and homogeneously nucleated material often called nanopowder (diameters in the range 10–100 nm). Nanopowder particles tend to be amorphous and have a spherical morphology with an average particle diameter of ~80 nm. Granular material is generally spherical, highly twinned, polycrystalline with crystallite sizes that can reach 200 nm, and includes regions of porosity. The porosity is ~1–4 volume percent, and only the smallest pores exhibit evidence of amorphous regions along the pore surface. The amount of nanopowder that agglomerates on the granular material has been identified using transmission electron microscopy, but agglomeration plays only a minor role in the overall growth process. Therefore, it is proposed that the primary mechanism for granular formation in commercial FBR is chemical vapor deposition, and the pores are associated with nanopowder agglomeration and incomplete sintering.
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Details
- Title
- Characterization of granular silicon, powders, and agglomerates from a fluidized bed reactor
- Creators
- M Zbib - School of Mechanical and Materials Engineering Washington State University PO Box 642920 Pullman WA 99164 USAM Dahl - School of Mechanical and Materials Engineering Washington State University PO Box 642920 Pullman WA 99164 USAU Sahaym - School of Mechanical and Materials Engineering Washington State University PO Box 642920 Pullman WA 99164 USAM Norton - School of Mechanical and Materials Engineering Washington State University PO Box 642920 Pullman WA 99164 USAE Osborne - REC Silicon Moses Lake WA 98837 USAD Bahr - School of Mechanical and Materials Engineering Washington State University PO Box 642920 Pullman WA 99164 USA
- Publication Details
- Journal of materials science, Vol.47(6), pp.2583-2590
- Academic Unit
- Mechanical and Materials Engineering, School of
- Publisher
- Springer US; Boston
- Identifiers
- 99900546761501842
- Language
- English
- Resource Type
- Journal article