Semiconductor Spacer Patterning for Fine-Pitch Etching
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Solution Overview
Problem
Existing photolithographic processes face limitations in resolving fine-pitch patterns for semiconductor device structures, hindering the formation of highly integrated semiconductor devices.
Innovation Solution
A method involving the formation of energy removable spacers on sidewalls of mask patterns, followed by etching the target layer using these spacers and additional mask patterns to achieve fine-pitch patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithographic processes are used to fabricate fine patterns, then photoresist patterns can be formed as masks, but the resolution of the exposure apparatus becomes a limiting factor that prevents achieving finer pitch sizes and critical dimensions
Solution Approach 1:
The patent divides the patterning process into multiple stages: first forming initial mask patterns, then using those masks to create spacers on sidewalls, and finally using the spacers as new masks to define even finer features. This multi-stage segmentation bypasses the single-step resolution limit of photolithography by iteratively creating finer pitch structures through self-aligned processes.
Solution Approach 2:
The patent transitions from planar 2D patterning to 3D structured patterning by forming vertical spacers on the sidewalls of initial mask patterns. This dimensional transition allows the pitch to be defined by the thickness of the spacer layer (a vertical dimension) rather than solely by the lateral resolution of the photolithography system, effectively overcoming the exposure apparatus resolution limit.
2Productivity
If photolithography is used to create finer photoresist patterns, then higher degree of integration can be achieved, but the exposure apparatus resolution limitation prevents further scaling
Solution Approach 1:
The patent performs preliminary actions by first forming the initial mask patterns and then using them to create the spacer structures before the final patterning step. This preliminary formation of self-aligned spacers establishes a precise geometric framework that enables subsequent etching to achieve finer pitch features than would be possible with direct photolithography alone, thereby increasing the degree of integration.
3Manufacturing precision
If existing fine-pitch pattern technologies are used, then adequate structures can be formed for intended purposes, but they cannot achieve further reduction in pitch size and critical dimension
Solution Approach 1:
The patent introduces a dynamic, iterative patterning approach where the spacer thickness can be controlled and adjusted to achieve different pitch sizes. This dynamic process allows continuous scaling to finer dimensions by simply adjusting the spacer deposition parameters, providing adaptability and versatility that static single-step photolithography cannot achieve.
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
Enables the creation of semiconductor device structures with fine-pitch patterns by reducing the pitch between protruding portions, enhancing integration and resolution.
Implementation Method 1
performing an energy treating process on the energy removable layer to transform portions of the energy removable layer into treated portions
Data Source
AI summary
A method for preparing a semiconductor device structure includes forming a target layer over a semiconductor substrate, and forming a plurality of first mask patterns over the target layer. The method also includes forming a plurality of energy removable spacers on opposite sidewalls of each of the first mask patterns, and forming a second mask pattern over the target layer and between the energy removable spacers. The method further includes removing the energy removable spacers, and etching the target layer using the first mask patterns and the second mask pattern as a mask.