Quantum Dot Gate Layout With Honeycomb Qubit Regions

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Solution Overview

Problem

Conventional quantum dot transistors are limited by the regular matrix arrangement of barrier and plunger gate stacks, restricting the configuration of quantum dot qubit regions.

Innovation Solution

The gate stacks are arranged in non-parallel axes, forming a honeycomb or polygonal structure, allowing for increased flexibility in the arrangement of quantum dot qubit regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If barrier gate stacks and plunger gate stacks are arranged in a regular matrix, then the device structure is simple and easy to manufacture, but the arrangement of quantum dot qubit regions is limited

Engineering Contradiction:

Improvearrangement flexibility of quantum dot qubit regionsVSAvoidgate stack arrangement structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies asymmetry by transitioning from a symmetric regular matrix arrangement to an asymmetric honeycomb arrangement of gate stacks. The honeycomb structure uses non-parallel axes and varied spacing between gate stacks, enabling more flexible configuration of quantum dot qubit regions while maintaining manufacturability through systematic patterning processes.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent introduces a new dimensional arrangement by organizing gate stacks in a honeycomb pattern that extends beyond the conventional two-dimensional grid. This hexagonal lattice structure utilizes angular relationships (60-degree angles) and radial positioning to create additional spatial degrees of freedom for qubit region placement.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Adaptability or versatility

If barrier gate stacks and plunger gate stacks are arranged in a regular matrix, then the manufacturing process is straightforward, but the design flexibility of quantum dot qubit regions is restricted

Engineering Contradiction:

Improvedesign flexibility of quantum dot qubit regionsVSAvoidgate stack arrangement process

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent segments the gate stack arrangement into modular hexagonal units that can be systematically replicated across the device area. Each honeycomb cell serves as a repeating module with standardized dimensions and orientations, allowing complex overall patterns to be constructed from simple, manufacturable building blocks through iterative deposition and etching cycles.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250366266A1Semiconductor device and manufacturing method thereof

Publication Date: 2025.11.27 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

A semiconductor device includes a substrate and a quantum dot transistor disposed on the substrate and includes a first barrier gate stack, a second barrier gate stack and a first plunger gate stack disposed between the first barrier gate stack and the second barrier gate stack. The first barrier gate stack and the first plunger gate stack are arranged in a first straight axis, the first plunger gate stack and the second barrier gate stack are arranged in a second straight axis, and there is a first angle between the first straight axis and the second straight axis is not equal to 180°.