Graphene Electronic Devices Multi-Layered Gate Insulating Layer

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Solution Overview

Problem

Graphene electronic devices face reduced mobility when in contact with inorganic insulating layers or when exposed to moisture, leading to instability in electrical characteristics.

Innovation Solution

A multi-layered gate insulating layer is introduced, comprising an organic insulating layer with a fluorine group polymer between the graphene channel layer and an inorganic insulating layer, which reduces moisture absorption and foreign material interference, maintaining charge-neutrality and mobility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If graphene contacts an inorganic insulating layer, then device structure is simplified, but mobility is reduced

Engineering Contradiction:

Improvegate insulating layer structureVSAvoidelectrical mobility

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent applies composite materials by combining organic and inorganic insulating layers to create a multi-layered gate insulating structure. The organic layer (first insulating layer) with hydrophobic properties is positioned between the graphene channel and the inorganic insulating layer (second insulating layer), creating a composite structure that leverages the advantages of both material types to prevent moisture-induced doping while maintaining structural integrity.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The organic insulating layer serves as an intermediary layer between the graphene channel and the inorganic insulating layer. This intermediate layer prevents direct contact between graphene and the inorganic material, thereby eliminating the harmful interaction that causes mobility reduction while still allowing the inorganic layer to provide necessary insulation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If graphene is exposed to air atmosphere, then device manufacturing is simplified, but moisture absorption reduces mobility

Engineering Contradiction:

Improvedevice fabrication processVSAvoidelectrical mobility

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The organic insulating layer is applied in advance to the graphene channel surface before the device is exposed to air atmosphere. This preliminary protective layer prevents moisture from the air atmosphere from being absorbed by the graphene, thereby preemptively counteracting the harmful effect of air exposure on electrical mobility.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The organic insulating layer creates a protective environment around the graphene channel, effectively isolating it from the harmful air atmosphere. The hydrophobic properties of the organic layer repel moisture molecules in the air, maintaining an inert-like protective barrier that prevents moisture-induced doping.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

3Device complexity

If a single-layer inorganic insulating layer is used, then manufacturing process is simplified, but charge-neutrality cannot be maintained

Engineering Contradiction:

Improvegate insulating layer structureVSAvoidcharge-neutrality

Core Design Contradiction:

Device complexityVSStability of the object's composition

Solution Approach 1:

The patent employs composite materials by integrating an organic insulating layer with hydrophobic properties and an inorganic insulating layer. This composite structure maintains charge-neutrality of the graphene channel by preventing moisture-induced doping, while the inorganic layer provides additional insulation and structural stability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The organic insulating layer acts as an intermediary that protects the graphene channel from moisture exposure. By positioning this layer between the graphene and the external environment (including the inorganic layer), it maintains charge-neutrality by preventing water molecules from causing unwanted doping effects.

Inventive Principle:

Principle #24Intermediary (Mediator)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution effectively stabilizes the Dirac voltage and maintains high hole mobility even after exposure to air, reducing the impact of moisture-induced doping and ensuring consistent performance.

Implementation Method 1

graphene electronic devices having a hydrophobic organic insulating layer between a graphene channel layer and a gate insulating layer

Methodology Applied

Scientific EffectHydrophobe: Hydrophobe

Data Source

PatentUS8994079B2Graphene electronic devices having multi-layered gate insulating layer

Publication Date: 2015.03.31 SAMSUNG ELECTRONICS CO LTD

AI summary

A graphene electronic device includes a multi-layered gate insulating layer between a graphene channel layer and a gate electrode. The multi-layered gate insulating layer includes an organic insulating layer and an inorganic insulating layer on the organic insulating layer.