IC Gate Spacing with Dielectric Gate Cuts for Higher Density
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Solution Overview
Problem
Conventional gate fabrication techniques for integrated circuits face challenges in scaling down transistors due to incomplete removal of dummy gate materials, tapered hole profiles, and difficulty in filling high aspect ratio holes, leading to unacceptably low yields and limitations in increasing device density.
Innovation Solution
The proposed solution involves improved gate cut techniques that include forming a monolithic gate structure perpendicular to device regions and using dielectric materials to create a gate cut, which avoids the risks associated with conventional methods by achieving small gate cut sizes and maintaining device reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional gate fabrication techniques are used, then existing manufacturing processes can be maintained, but device density increases are limited and yields become unacceptably low due to incomplete removal of dummy gate materials, tapered hole profiles, and difficulty in filling high aspect ratio holes
Solution Approach 1:
The gate structure is divided into multiple segments with different materials (first gate metal, second gate metal, third gate metal) that can be formed and processed independently. This segmentation allows each layer to be optimized separately, enabling complete removal of dummy gate materials and precise control over gate cut dimensions without the limitations of conventional monolithic gate fabrication.
Solution Approach 2:
The patent transitions from planar gate structures to vertically stacked three-dimensional gate structures. By adding the vertical dimension with multiple gate metal layers stacked perpendicular to the substrate, the invention achieves higher device density while maintaining manufacturability through selective etching and filling processes that work effectively in the vertical dimension.
2Productivity
If gate cut size is reduced to increase device density, then more devices can be packed, but manufacturing precision becomes increasingly difficult to maintain
Solution Approach 1:
Dielectric materials are deposited and patterned to form gate cut structures before the actual gate metal formation. This preliminary action creates precisely defined boundaries and spacing for the gate structures, ensuring that even at reduced gate cut sizes, the manufacturing precision is maintained through pre-established geometric constraints that guide subsequent fabrication steps.
Solution Approach 2:
Dielectric materials serve as intermediary structures between the gate metals and the substrate, providing precise spacing and alignment control. These dielectric layers act as mediators that define the exact positions and dimensions of gate cuts, enabling small gate cut sizes to be manufactured with high precision through the self-aligning properties of the dielectric structures.
Data Source
AI summary
Discussed herein is gate spacing in integrated circuit (IC) structures, as well as related methods and components. For example, in some embodiments, an IC structure may include: a first gate metal having a longitudinal axis; a second gate metal, wherein the longitudinal axis of the first gate metal is aligned with a longitudinal axis of the second gate metal; a first gate contact above the first gate metal; a second gate contact above the second gate metal; and an unordered region having an unordered lamellar pattern, wherein the unordered region is coplanar with the first gate contact and the second gate contact.