Semiconductor Spacer Patterning for Multi-Spacing Conductive Lines
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Solution Overview
Problem
The semiconductor industry faces challenges in manufacturing complex ICs due to the increasing complexity of patterning methods for forming dielectric patterns with varying widths, which affects the spacing between conductive lines, leading to issues such as capacitance variations and reduced manufacturing efficiency.
Innovation Solution
A method involving the formation of multiple spacer layers with different thicknesses to create spacers of varying widths, allowing for the definition of multiple spacings between conductive lines, achieved through a series of deposition, patterning, and etching processes, enabling flexible layout design and improved device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional single-spacing patterning methods are used, then manufacturing process is simpler, but layout design flexibility is reduced and capacitance control is limited
Solution Approach 1:
The patterning process is segmented into multiple independent spacer formation stages. First spacers are formed with a first spacing, then second spacers are formed with a second spacing. This segmentation allows each spacer layer to be optimized independently for specific spacing requirements, providing layout design flexibility without requiring complete process redesign.
Solution Approach 2:
The patent transitions from single-layer patterning to multi-layer spacer structure. By adding vertical dimensionality with stacked spacer layers, the system can define multiple horizontal spacings simultaneously. This dimensional transition enables complex 2D spacing patterns to be achieved through controlled 3D spacer formation and selective removal.
2Adaptability or versatility
If multiple spacer layers with different thicknesses are formed, then multiple spacings between conductive lines are achieved, but manufacturing process complexity increases
Solution Approach 1:
Multiple spacer layers are merged into a unified interconnect structure. The first and second spacers are formed in sequence and integrated into the same dielectric layer, allowing multiple spacing configurations to be achieved within a single manufacturing flow. This merging approach consolidates what could be separate processes into one coherent structure formation sequence.
Solution Approach 2:
Different regions of the structure receive different spacer thicknesses and materials tailored to local spacing requirements. First spacers provide one spacing configuration while second spacers provide another, allowing local optimization of capacitance and spacing characteristics without affecting the entire chip uniformly. Each region's spacer properties are customized to its specific electrical and geometric requirements.
3Reliability
If uniform spacer thickness is used, then manufacturing process is simpler, but capacitance control between conductive lines is limited
Solution Approach 1:
The spacer structure implements local quality by using different thicknesses and materials for first and second spacers in different regions. This allows capacitance control to be optimized locally - thicker spacers or different dielectric materials can be used where higher capacitance is needed, while thinner spacers provide lower capacitance where required. Each location's spacer properties are precisely controlled to meet its specific capacitance specification.
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 allows for the formation of conductive lines with distinct spacings, reducing capacitance between lines and enhancing device performance by providing multiple spacing options, thereby improving manufacturing efficiency and flexibility in semiconductor structure design.
Implementation Method 1
forming a first spacer and a second spacer on sidewalls of the plurality of mandrel patterns
Implementation Method 2
patterning the dielectric layer using the first spacer and the second spacer as a patterning mask
Data Source
AI summary
A semiconductor structure and method of forming the same are provided. The method includes: forming a plurality of mandrel patterns over a dielectric layer; forming a first spacer and a second spacer on sidewalls of the plurality of mandrel patterns, wherein a first width of the first spacer is larger than a second width of the second spacer; removing the plurality of mandrel patterns; patterning the dielectric layer using the first spacer and the second spacer as a patterning mask; and forming conductive lines laterally aside the dielectric layer.