Graphene Laminate with Fluorine-Containing Lithium Inorganic Layer

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing graphene-based laminates face challenges in maintaining stable electron doping and improved electron mobility due to degradation issues and adhesion problems with high-k transition metal oxides, which affect the performance of electronic devices.

Innovation Solution

A graphene-based laminate is developed with an inorganic layer containing a fluorine-containing lithium compound, such as LiF, deposited on a graphene layer using thermal chemical vapor deposition, which enhances electron doping stability and mobility by self-passivation and Fermi level control, while also addressing adhesion issues.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If conventional interlayer materials or conductive materials are introduced on graphene to control charge-carrier density, then electron doping is achieved, but doping stability is degraded

Engineering Contradiction:

Improvecharge-carrier densityVSAvoiddoping stability

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

A fluorine-containing organic compound layer is introduced as an intermediary between the graphene layer and the inorganic layer. This intermediary layer prevents direct contact and unwanted reactions between the inorganic layer and graphene, while still allowing effective electron doping to occur. The compound contains fluorine atoms that facilitate charge transfer to graphene, achieving the desired charge-carrier density control while maintaining doping stability through the protective intermediary function.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs a composite structure consisting of multiple layers: graphene layer, fluorine-containing organic compound layer, and inorganic layer. This composite material approach combines the advantages of each component - the high electron mobility of graphene, the stability and protection provided by the organic compound layer, and the effective electron doping capability of the inorganic layer, thereby achieving both high charge-carrier density and stable doping.

Inventive Principle:

Principle #40Composite materials

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 laminate achieves stable electron doping and improved electron mobility, maintaining device performance over time and reducing impurity effects, with the inorganic layer providing a self-passivation effect and screening impurities.

Implementation Method 1

enhances electron doping stability and mobility by self-passivation and Fermi level control

Methodology Applied

Scientific EffectSelf-passivation:

Implementation Method 2

screening impurities

Methodology Applied

Scientific EffectScreening:

Implementation Method 3

depositing an inorganic layer including a fluorine-containing lithium compound on the disposed graphene layer

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Data Source

PatentUS9978841B2Graphene-based laminate and method of preparing the same

Publication Date: 2018.05.22 VERSARIEN PLC

AI summary

Provided are a graphene-based laminate and a method of preparing the graphene-based laminate. The graphene-based laminate may include a substrate; a graphene layer formed on at least one surface of the substrate; and an inorganic layer formed on the graphene layer and including a fluorine-containing lithium compound.