Patternable Low-k Dielectric for Interconnect Patterning
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Solution Overview
Problem
Current semiconductor manufacturing processes for interconnect structures, particularly dual-damascene integration, are complex, costly, and inefficient due to the need for multiple sacrificial hardmask layers and plasma etching, which damages low-k dielectric materials and increases manufacturing costs and defects.
Innovation Solution
A method that combines the functions of a photoresist and a dielectric material into a single patternable low-k dielectric, eliminating the need for separate photoresists and plasma etching, and simplifies the process by using a photo-patternable low-k material that acts as both a resist and a dielectric, reducing the number of layers and processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple sacrificial hardmask layers are used in dual-damascene integration, then patterning capability is improved, but device complexity and manufacturing cost increase significantly
Solution Approach 1:
The patent combines the functions of the dielectric material and the photoresist into a single patternable low-k dielectric layer. This eliminates the need for separate sacrificial hardmask layers, reducing the number of deposition and removal steps while maintaining patterning capability. The unified material serves both as the structural dielectric and as the patterning resist.
Solution Approach 2:
The patternable low-k dielectric material performs multiple functions simultaneously: it provides electrical insulation, enables lithographic patterning, and serves as the final dielectric structure. This multi-functionality eliminates the need for separate sacrificial layers that would otherwise be required to protect and pattern the dielectric.
2Manufacturing precision
If plasma etching is used for patterning, then etching precision is improved, but low-k dielectric materials are damaged and reliability decreases
Solution Approach 1:
The patent replaces the plasma etching process with a photo-lithographic patterning approach. Instead of using plasma to physically etch the dielectric material, the invention uses light-sensitive chemistry in the patternable low-k dielectric to define patterns through exposure and development, thereby avoiding plasma-induced damage while achieving precise patterning.
3Adaptability or versatility
If separate photoresist and dielectric layers are used, then functional flexibility is improved, but manufacturing cost and processing time increase
Solution Approach 1:
The invention merges the photoresist function and the dielectric function into a single patternable low-k dielectric material. This eliminates the need for separate deposition steps for photoresist and dielectric layers, reduces the number of patterning steps, and decreases overall processing time while maintaining the necessary functional flexibility.
4Speed
If low-k dielectric materials are used to reduce RC delays, then signal propagation speed is improved, but susceptibility to processing damage increases
Solution Approach 1:
The patent replaces the plasma etching process with photo-lithographic patterning to avoid plasma-induced damage to the low-k dielectric material. This substitution maintains the signal propagation speed benefits of low-k materials while eliminating the processing damage that would otherwise compromise material integrity and device reliability.
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 significantly reduces manufacturing complexity and cost, improves yield by eliminating defect-prone plasma etching, and enhances the reliability of low-k dielectric materials by protecting them from damage during processing.
Implementation Method 1
a photo-patternable low-k material that acts as both a resist and a dielectric
Data Source
AI summary
The present invention provides an interconnect structure in which a patternable low-k material is employed as an interconnect dielectric material. Specifically, this invention relates to single-damascene and dual-damascene low-k interconnect structures with at least one patternable low-k dielectric. In general terms, the interconnect structure includes at least one patterned and cured low-k dielectric material located on a surface of a substrate. The at least one cured and patterned low-k material has conductively filled regions embedded therein and typically, but not always, includes Si atoms bonded to cyclic rings via oxygen atoms. The present invention also provides a method of forming such interconnect structures in which no separate photoresist is employed in patterning the patterned low-k material.