Silica-Based Insulation Layer for Low Dielectric Constant
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Solution Overview
Problem
The increasing integration and miniaturization of semiconductor chips pose challenges in achieving a balance between low dielectric constant and high mechanical properties in insulation layers, leading to issues such as RC delay and cross-talk due to the proximity of wires, which existing technologies have not adequately addressed.
Innovation Solution
A composition for forming a silica-based insulation layer is developed, comprising an organosilane-based condensation polymerization product with specific structural units and a thermal acid generator, which is applied to a substrate, dried, and cured at high temperatures under an inert gas atmosphere, resulting in a layer with a low dielectric constant and high modulus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional insulation layer materials are used to achieve low dielectric constant, then the dielectric constant is reduced, but the mechanical properties (modulus) deteriorate
Solution Approach 1:
The patent employs a composite material system consisting of organosilane-based condensation polymerization product containing specific structural units (Formula 1 with controlled R1-R4 groups and m values) combined with thermal acid generator. This composite approach enables simultaneous achievement of low dielectric constant (1.9-3.5) and high modulus (4-18 GPa) by combining materials with complementary properties, where the organosilane provides dielectric performance and the thermal acid generator facilitates controlled curing to maintain mechanical strength.
Solution Approach 2:
The patent utilizes parameter changes through controlling the molecular weight of the organosilane-based condensation polymerization product (Mw: 3,000-20,000) and adjusting the structural parameters in Formula 1 (R1 as hydrogen, hydroxy group, alkyl, aryl, or vinyl; R2-R4 as hydrogen, hydroxy group, alkoxy, halogen-containing group, or silicon-containing group; m as integer 1-6). These parameter optimizations enable the material to achieve both low dielectric constant and high modulus by tuning the polymer structure and composition.
2Productivity
If wire spacing is reduced to increase integration, then integration is improved, but RC delay and cross-talk increase due to proximity effects
Solution Approach 1:
The patent addresses signal integrity issues by changing the dielectric parameter (dielectric constant) to a lower range (1.9-3.5) through optimized organosilane polymer composition. This parameter change reduces RC delay by lowering the capacitive coupling between adjacent wires, enabling higher integration while maintaining signal integrity. The controlled modulus (4-18 GPa) also provides mechanical stability to prevent wire migration and maintain spacing precision.
3Strength
If curing temperature is increased to improve mechanical properties, then modulus is improved, but material degradation may occur
Solution Approach 1:
The patent employs inert atmosphere (nitrogen or argon) during the high-temperature curing process (200°C or higher) to prevent material degradation through oxidation or unwanted chemical reactions. This inert environment allows the organosilane-based condensation polymerization product to achieve high modulus (4-18 GPa) through complete curing while maintaining material stability and preventing degradation, thereby resolving the contradiction between improving mechanical properties and maintaining material integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves a silica-based insulation layer with a dielectric constant of 1.9 to 3.5 and a modulus of 4 GPa to 18 GPa, providing excellent mechanical characteristics and low dielectric constant, thereby addressing the integration challenges in semiconductor technology.
Implementation Method 1
an organosilane-based condensation polymerization product that includes a structural unit represented by the following Chemical Formula 1
Implementation Method 2
curing the resultant at about 200° C. or more under an inert gas atmosphere
Data Source
AI summary
A composition for forming a silica-based insulation layer, a silica-based insulation layer, and a method of manufacturing the silica-based insulation layer, the composition including a solvent; and an organosilane-based condensation polymerization product that includes a structural unit represented by the following Chemical Formula 1: