MXene-Polyvinylpyrrolidone Composite Electrode for Flexible Displays

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Solution Overview

Problem

Current transparent electrodes fail to simultaneously achieve high flexibility, tensile strength, conductivity, and light transmittance, which are essential for emerging applications like stretchable optoelectronic devices and flexible displays.

Innovation Solution

A display substrate with a transparent electrode composed of a composite material of MXene (two-dimensional transition metal carbide or nitride) and polyvinylpyrrolidone, filled into a patterned channel on a flexible substrate, offering high conductivity, transmittance, machinability, and ductility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If metal electrodes (such as silver) or carbon electrodes are used to improve conductivity, then conductive performance is improved, but flexibility and tensile performance deteriorate

Engineering Contradiction:

Improveconductive performanceVSAvoidflexibility and tensile performance

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent uses a composite material consisting of MXene (two-dimensional transition metal carbide, nitride or carbonitride) and polyvinylpyrrolidone. This composite structure combines the high conductivity of MXene with the flexibility and tensile strength of polyvinylpyrrolidone, resolving the contradiction between conductive performance and mechanical flexibility. The composite material enables the transparent electrode to achieve both high conductivity and excellent flexibility simultaneously.

Inventive Principle:

Principle #40Composite materials

2Reliability

If transparent electrode requirements increase for high conductivity and high light transmittance, then optoelectronic efficiency is improved, but adhesive ability and flexibility deteriorate

Engineering Contradiction:

Improveoptoelectronic efficiencyVSAvoidadhesive ability and flexibility

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The MXene-polyvinylpyrrolidone composite material provides high conductivity and high light transmittance while maintaining good adhesive ability to the substrate. The polyvinylpyrrolidone component enhances adhesion to the substrate, while the MXene provides conductivity and transparency, thus resolving the contradiction between optoelectronic efficiency and adhesive ability.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent employs a thin film structure for the transparent electrode that maintains flexibility and conformability to the substrate. The thin film approach allows the electrode to bend and stretch with the flexible substrate while maintaining its electrical and optical properties, thus resolving the contradiction between high optoelectronic efficiency and flexibility.

Inventive Principle:

Principle #30Flexible shells and thin films

3Adaptability or versatility

If stretchable optoelectronic devices are developed requiring adjustable tensile strengths, then adaptability is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveadjustable tensile strengthsVSAvoidmanufacturing complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent enables adjustable tensile strengths by modifying the composition ratio of MXene to polyvinylpyrrolidone in the composite material. By changing the concentration or proportion of these components during manufacturing, different tensile properties can be achieved to meet different application requirements. This parameter adjustment approach provides adaptability without significantly increasing manufacturing complexity, as it involves simple compositional variations rather than complex process changes.

Inventive Principle:

Principle #35Parameter changes

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 provides a transparent electrode with enhanced performance, supporting high-frequency displays and meeting requirements for flexible devices such as OLEDs, touch panels, and wearable technology by ensuring high conductivity, transmittance, and flexibility.

Implementation Method 1

adding the MAX phase material into the etching liquid to obtain a first suspension containing a multi-layer MXene material

Methodology Applied

Scientific EffectChemical etching: Ablation

Implementation Method 2

adding dimethyl sulfoxide into the first suspension to obtain an one-layer MXene material

Methodology Applied

Scientific EffectIntercalation and exfoliation: Interference

Implementation Method 3

adding the one-layer MXene material into a polyvinylpyrrolidone solution to obtain a second suspension

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS11335474B2Display substrate having transparent electrode and manufacturing method thereof

Publication Date: 2022.05.17 TCL CHINA STAR OPTOELECTRONICS TECHNOLOGY CO LTD

AI summary

A display substrate having a transparent electrode and manufacturing method thereof includes a transparent substrate, and a patterned channel is disposed on the transparent substrate; a transparent electrode including a composite material of MXene material and polyvinylpyrrolidone, and the transparent electrode is filled in the patterned channel. The transparent electrode of embodiments of the present disclosure has advantages of high transmittance, high conductivity, great machinability, great substrate affinity, great ductility, etc.