Spacer Sidewall Augmentation for Pitch Multiplication
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Solution Overview
Problem
Current pitch multiplication methods face challenges in achieving a balanced inner and outer space in spacers, leading to non-uniform feature alignment and reliability issues in integrated circuit fabrication, as the spacing between spacers cannot be selectively altered once formed.
Innovation Solution
The method involves selectively modifying the inner or outer spaces of spacers by laterally expanding their sidewalls through deposition and etching of augmentation materials, allowing for differential growth or reduction of space widths, and using anisotropic etches to maintain or adjust the spacer dimensions for uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pitch multiplication methods are used to reduce feature size, then manufacturing precision is improved, but the spacing between spacers cannot be selectively altered leading to non-uniform feature alignment
Solution Approach 1:
The patent applies local quality by selectively modifying the inner or outer spaces of spacers in specific regions. Through targeted deposition and anisotropic etching, only certain spacer spaces are adjusted while others remain unchanged, enabling region-specific spacing control that maintains uniform feature alignment where needed while providing adaptability where required
Solution Approach 2:
The patent introduces dynamics by making spacer spacing adjustable and modifiable after the initial pitch multiplication process. The multi-step process involving deposition, anisotropic etching, and selective removal transforms static spacer structures into dynamically adjustable ones, allowing spacing to be optimized for different fabrication requirements
2Adaptability or versatility
If spacer dimensions are modified to adjust spacing, then adaptability is improved, but manufacturing precision deteriorates due to non-uniform feature alignment
Solution Approach 1:
The patent applies segmentation by dividing the spacer modification process into distinct stages: initial spacer formation, selective deposition on inner or outer surfaces, anisotropic etching to differential growth, and selective removal. This segmented approach allows independent control of inner and outer spaces, enabling spacing adjustment while maintaining feature alignment uniformity through controlled, stepwise modifications
3Ease of manufacture
If conventional photolithography is used to pattern features, then ease of manufacture is maintained, but manufacturing precision deteriorates at minimum pitch limits
Solution Approach 1:
The patent applies preliminary action by first forming spacers with conventional photolithography to establish a preliminary pattern, then using deposition and anisotropic etching to refine and adjust the spacing. This preliminary patterning step allows the use of simple, well-established photolithography techniques while subsequent steps enhance precision beyond the original photolithography limits
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 enables the selective adjustment of spacer dimensions, improving the uniformity and reliability of feature alignment and spacing, thereby enhancing the precision and consistency of integrated circuit fabrication.
Implementation Method 1
depositing an augmentation material onto the plurality of spacers
Implementation Method 2
etching the augmentation material with an anisotropic etch to form a pattern of augmented spacers
Data Source
AI summary
Methods for circuit material processing are provided. In at least one such method, a substrate is provided with a plurality of overlying spacers. The spacers have substantially straight inner sidewalls and curved outer sidewalls. An augmentation material is formed on the plurality of spacers such that the inner or the outer sidewalls of the spacers are selectively expanded. The augmentation material can bridge the upper portions of pairs of neighboring inner sidewalls to limit deposition between the inner sidewalls. The augmentation material is selectively etched to form a pattern of augmented spacers having a desired augmentation of the inner or outer sidewalls. The pattern of augmented spacers can then be transferred to the substrate through a series of selective etches such that features formed in the substrate achieve a desired pitch.