Oxide Capping for 2D Transistor Channels Against Oxidation

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Solution Overview

Problem

The deployment of 2D materials in transistor structures is hindered by their sensitivity to fabrication processes, leading to oxidation and degradation of material properties, which affects the quality and performance of transistor devices.

Innovation Solution

A capping layer, composed of materials like HfOx, SiOx, ZrOx, YxOz, AlxOz, TaxOz, NbO, NbOx, or TiOx, is applied directly on the 2D channel material to protect it during subsequent processing steps such as lithography and etch, with optional carbon doping for enhanced protection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If 2D materials are used in transistor structures to achieve advanced scaling, then device performance and miniaturization are improved, but the materials become sensitive to fabrication processes leading to oxidation and degradation

Engineering Contradiction:

Improvedevice performanceVSAvoidoxidation and surface damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A capping layer is introduced as an intermediary protective barrier between the 2D channel material and the fabrication environment. This capping layer prevents direct exposure of the sensitive 2D material to oxidizing conditions during lithography and etch processes, thereby maintaining material integrity while enabling advanced device scaling

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The capping layer is applied in advance before subsequent fabrication steps that could cause oxidation. By pre-protecting the 2D material surface with the capping layer, the material is shielded from harmful environmental exposure during critical processing steps such as lithography and etch

Inventive Principle:

Principle #10Preliminary action

2Object-affected harmful factors

If a capping layer is applied to protect 2D channel material, then oxidation and surface damage are prevented, but device structure complexity increases

Engineering Contradiction:

Improvesurface oxidationVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The capping layer is implemented as a thin film structure that provides effective protection against oxidation and surface damage. This thin film approach maintains the compactness of the transistor structure while delivering the necessary protective function, thereby limiting the increase in overall device complexity

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentUS20260006861A1Capping layer for transition metal dichalcogenide based transistor structures

Publication Date: 2026.01.01 INTEL CORP

AI summary

Devices, transistor structures, systems, and techniques are described herein related to field effect transistors having one or more metal chalcogenide nanoribbons coupled to a source and a drain. Channel regions of the metal chalcogenide nanoribbons are coupled to a gate structure between the source and the drain. The metal chalcogenide nanoribbons are capped with a layer including an oxide of a metal or metalloid element, optionally doped with or including carbon.