Low-K Interconnect Dielectrics for Reduced RC Delay
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Solution Overview
Problem
The semiconductor industry faces challenges in scaling down integrated circuit dimensions due to issues such as isolation, leakage, reliability, parasitic series resistances, and parasitic coupling capacitances, which affect the performance of interconnect systems in densely packed metal lines.
Innovation Solution
The use of low dielectric constant (low-k) insulation layers, comprising predominantly Si—O bonds with a low dielectric constant, is implemented in multilevel interconnect systems to reduce parasitic line-to-line capacitance and series resistance, thereby improving signal transmission bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dielectric materials are used in interconnect systems, then mechanical strength and dielectric breakdown field are maintained, but parasitic line-to-line capacitance and series resistance increase, reducing signal transmission bandwidth
Solution Approach 1:
The patent changes the dielectric constant parameter of the insulation layer by using low-k dielectric materials (k<3.5) instead of conventional materials. This parameter change directly reduces parasitic line-to-line capacitance in densely packed metal lines, thereby improving signal transmission bandwidth and reducing RC time constants without compromising mechanical strength or dielectric breakdown field
Solution Approach 2:
The patent employs composite low-k dielectric materials comprising predominantly Si-O bonds with specific chemical compositions (such as silicon oxide, silicon oxynitride, or fluorosilicate glass) that combine low dielectric constant with adequate mechanical properties and breakdown field strength, resolving the contradiction between reducing parasitic effects and maintaining structural integrity
2Productivity
If feature dimensions are scaled down to increase density, then intrinsic speed and functionality improve, but isolation, leakage, and parasitic effects worsen
Solution Approach 1:
The patent changes the dielectric parameter (dielectric constant) to low-k values to reduce parasitic capacitance that becomes significant at scaled dimensions. This enables higher component density and intrinsic speed while mitigating the worsening parasitic effects that normally accompany dimension scaling
Solution Approach 2:
The low-k dielectric material serves as an intermediary between closely spaced metal lines, reducing the electromagnetic coupling and parasitic capacitance that arise at small feature sizes, thereby enabling higher density interconnect systems with improved isolation characteristics
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
This approach reduces the RC time constant, enhancing the performance of integrated circuits by allowing higher density and speed of electronic components while maintaining mechanical strength and dielectric breakdown electric field, thus improving manufacturing yield and reliability.
Implementation Method 1
low dielectric constant (low-k) insulation layers, comprising predominantly Si—O bonds with a low dielectric constant
Implementation Method 2
depositing a dielectric material over the conductive element, the depositing the dielectric material includes, placing the substrate into a processing chamber; introducing a first precursor to the processing chamber, the first precursor includes silicon atoms and oxygen atoms
Data Source
AI summary
Methods to form low-k dielectric materials for use as intermetal dielectrics in multilevel interconnect systems, along with their chemical and physical properties, are provided. The deposition techniques described include PECVD, PEALD, and ALD processes where the precursors such as TEOS and MDEOS may provide the requisite O-atoms and O2 gas may not be used as one of the reactants. The deposition techniques described further include PECVD, PEALD, and ALD processes where O2 gas may be used and, along with the O2 gas, precursors containing embedded Si—O—Si bonds, such as (CH3O)3—Si—O—Si—(CH3O)3) and (CH3)3—Si—O—Si—(CH3)3 may be used.