Semiconductor Patterning for Sharp Active Corners and Short Isolation
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Solution Overview
Problem
In semiconductor device patterning, corner rounding leads to increased pattern size and potential electrical shorts, hindering integration and electrical characteristics.
Innovation Solution
A method involving sequential exposure and etching processes using masks with different patterns to form active and gate patterns with angular corners and straight-line end caps, reducing corner rounding and preventing shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional single-step patterning is used, then the manufacturing process is simple, but corner rounding occurs leading to increased pattern size and potential electrical shorts
Solution Approach 1:
The patterning process is divided into two separate steps: first forming an intermediate pattern with a first mask, then forming the final pattern with a second mask. This segmentation allows each step to optimize for specific corner formation, achieving sharp corners in the final pattern while managing overall process complexity through systematic division of tasks.
Solution Approach 2:
The first mask pattern is designed to pre-form an intermediate pattern that includes extended corner regions. This preliminary action prepares the substrate in advance for the second patterning step, enabling the second mask to precisely define the final sharp corners by removing material from the pre-formed intermediate structure.
2Reliability
If corner rounding is accepted, then the patterning process is simpler, but the active pattern area increases and electrical shorts may occur
Solution Approach 1:
By segmenting the patterning into two steps with different mask designs, the process achieves sharp corners that prevent electrical shorts between adjacent patterns. The first mask creates an intermediate structure, and the second mask refines it to the final sharp-cornered pattern, ensuring electrical isolation while maintaining manufacturability.
Solution Approach 2:
The first mask pattern is designed with specific corner extensions in certain regions while maintaining standard geometry in other regions. This local differentiation allows precise control over where sharp corners are formed, enabling electrical isolation in critical areas while keeping the overall process manageable through localized quality adjustments rather than global process changes.
3Area of moving object
If angular corners are formed, then pattern size is reduced and shorts are prevented, but the patterning process becomes more complex requiring multiple mask steps
Solution Approach 1:
The complex task of forming angular corners is segmented into two manageable patterning steps. The first step creates an intermediate pattern that establishes the basic structure, and the second step precisely forms the angular corners by removing material at specific locations. This segmentation reduces the active pattern area through sharp corners while distributing process complexity across two simpler, more controllable steps.
Solution Approach 2:
The first patterning step performs a preliminary action by forming an intermediate pattern that includes extended corner regions. This preliminary structure reduces the final active pattern area by pre-positioning material that will be selectively removed in the second step to create sharp corners, thereby minimizing the final pattern area while managing complexity through staged material removal.
Data Source
AI summary
A semiconductor device includes an active pattern having sharp corners. The semiconductor device includes a peripheral circuit including a substrate, a resistor device in the substrate, and an active pattern on the substrate. When viewed in a plan view, the active pattern includes corners in a serpentine shape, and first and second shapes of the corners are different from each other.