Silicon Polymerization for High-Purity Thin Films
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Summary
Problems
Existing methods for forming polysilane films from cyclopentasilane result in products with high branching and insolubility issues, making them unsuitable for coating and printing applications due to their volatile nature and low molecular weight.
Innovation solutions
A method involving the use of elemental Group 7-12 transition metal catalysts, such as Rh and Ru, to catalyze the dehydrogenative polymerization of cyclopentasilane, producing polysilanes with controlled molecular weight and reduced branching, allowing for the formation of amorphous, hydrogenated semiconductor films with low carbon content.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If Zr catalysts are used for polymerization of cyclopentasilane, then high molecular weight polysilane is formed, but the polysilane becomes intractable and insoluble due to high branching
Why choose this principle:
The patent changes the catalyst parameter from early transition metals (Zr) to late transition metals (Rh, Ru, Ir, Pd, Pt), which fundamentally alters the polymerization mechanism to produce linear chains with minimal branching while maintaining high molecular weight, thereby resolving the contradiction between molecular weight and solubility
Principle concept:
If Zr catalysts are used for polymerization of cyclopentasilane, then high molecular weight polysilane is formed, but the polysilane becomes intractable and insoluble due to high branching
Why choose this principle:
The patent substitutes the catalytic mechanism from Zr-based catalysts that promote branching to Rh/Ru-based catalysts that enable controlled dehydrogenative coupling with linear growth, replacing the underlying chemical mechanism to achieve both high molecular weight and solubility
Application Domain
Data Source
AI summary:
A method involving the use of elemental Group 7-12 transition metal catalysts, such as Rh and Ru, to catalyze the dehydrogenative polymerization of cyclopentasilane, producing polysilanes with controlled molecular weight and reduced branching, allowing for the formation of amorphous, hydrogenated semiconductor films with low carbon content.
Abstract
Compositions and methods for controlled polymerization and/or oligomerization of hydrosilanes compounds including those of the general formulae Si n H 2n and Si n H 2n+2 as well as alkyl- and arylsilanes, to produce soluble silicon polymers as a precursor to silicon films having low carbon content.