Self-Aligned Gate Cut Layout for Tight Transistor Spacing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of reducing the size of memory and logic cells and inter-device spacing in semiconductor devices is becoming increasingly difficult as integrated circuits scale downward, necessitating improved gate cut structures for further scaling and electrical isolation between transistors.
Innovation Solution
A self-aligned gate cut structure is introduced that electrically isolates adjacent transistors by forming self-aligned gate cut structures that maintain consistent distances to semiconductor channel regions, allowing for precise control of gate cut and extension widths, independent of lithography, and utilizing amorphous silicon layers for precise alignment and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional gate cut processes are used to reduce inter-device spacing, then device scaling is enabled, but manufacturing precision and alignment control become increasingly difficult
Solution Approach 1:
The patent applies preliminary action by forming the gate cut structure before final gate patterning. The gate cut trench is created and filled with dielectric material in advance, establishing precise alignment references that guide subsequent gate formation steps. This preliminary structuring enables controlled inter-device spacing while maintaining manufacturing precision through self-alignment mechanisms.
Solution Approach 2:
The patent introduces an intermediary gate cut structure consisting of a trench filled with dielectric material. This intermediary structure acts as a mediator between adjacent transistor gates, providing physical and electrical isolation while enabling precise spacing control. The gate cut structure serves as a reference framework that facilitates accurate alignment of surrounding gate structures during fabrication.
2Reliability
If gate cut structures are formed to electrically isolate adjacent transistors, then device performance is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple functions into the gate cut structure. The same dielectric-filled trench provides both electrical isolation between adjacent transistors and serves as an alignment reference for gate patterning. This consolidation reduces the need for separate isolation structures, thereby improving electrical isolation while minimizing the increase in device complexity.
Solution Approach 2:
The gate cut structure exhibits multi-functionality by simultaneously providing electrical isolation, mechanical support, and alignment referencing. The dielectric material in the trench isolates adjacent transistor gates electrically, while the trench geometry itself serves as a pattern reference for subsequent lithography steps. This universal structure reduces overall device complexity despite enhancing isolation capabilities.
Data Source
AI summary
A semiconductor device is provided that includes a self-aligned gate cut structure electrically isolating, at least in part, a gate structure of a first transistor from a gate structure of a second transistor. The distance from a semiconductor channel region of the first transistor to the self-aligned gate cut structure is the same as the distance from a semiconductor channel region of the second transistor to the self-aligned gate cut structure.