Polymerization Inhibitor for Silane
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United States of America Patent
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Oct 27, 2015
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Nov 4, 2014
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Abstract
A polymerization inhibitor for a silane enables purification of the silane to a high degree because a polymer is not formed even when heating to distill the silane, even when a cyclic silane monomer is present. A high-purity cyclic silane composition is obtained, in particular high-purity cyclopentasilane, that can be polymerized and applied onto a substrate as a coating-type polysilane composition and fired to produce a good silicon thin film with high conductivity. The polymerization inhibitor includes a secondary or tertiary aromatic amine. The aromatic group is a phenyl group or a naphthyl group. The polymerization inhibitor is present in a proportion of 0.01 to 10 mol % per mole of the silane. In the polymerization inhibitor, a boiling point of the aromatic amine is 196° C. or higher.
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