CuO-Seeded Transparent Conductors for Ultra-Thin Noble Metal Films
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing transparent conductors like ITO face issues with indium scarcity, manufacturing defects, brittleness, and inadequate performance in infrared applications due to plasma resonances, while ultra-thin metal films of noble metals suffer from oxidation and insufficient transparency and conductivity.
Innovation Solution
A seed layer of cupric oxide (CuO) with a thickness less than or equal to 1.3 nm is applied to a body, followed by a noble metal ultra-thin film, enhancing adherence and resistance to oxidation, maintaining transparency across visible and infrared spectra.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ITO is used as a transparent conductor, then electrical conductivity and visible transparency are achieved, but indium scarcity and high cost occur
Solution Approach 1:
The patent changes the material composition parameters by replacing ITO with alternative transparent conductive materials such as aluminum-doped zinc oxide (AZO) and fluorine-doped tin oxide (FTO), which use abundant elements instead of scarce indium, while maintaining electrical conductivity through doping mechanisms
Solution Approach 2:
The patent employs cheaper alternative materials (AZO, FTO) that can be deposited as thin films to replace expensive ITO, achieving cost reduction while maintaining functional performance through optimized film thickness and composition
2Reliability
If ITO is applied to a body, then transparent conductivity is achieved, but surface defects and vacancies occur requiring post-deposition treatments
Solution Approach 1:
The patent applies preliminary surface treatment to the body substrate before depositing the transparent conductive material, including plasma treatment and chemical etching, to ensure surface cleanliness and proper adhesion, thereby preventing surface defects and vacancies in the final coating
Solution Approach 2:
The patent optimizes deposition parameters such as deposition temperature, pressure, and material composition ratios during the coating process to achieve dense, defect-free films with improved surface quality and reduced vacancies
3Reliability
If ITO is used in flexible applications, then transparent conductivity is achieved, but brittleness prevents flexible article formation
Solution Approach 1:
The patent changes the mechanical parameters by depositing ultra-thin films (50-200 nm) of transparent conductive materials on flexible substrates, and by controlling the grain structure and stress state of the coating to achieve flexibility while maintaining electrical conductivity
Solution Approach 2:
The patent employs thin film technology to create flexible transparent conductive coatings on flexible substrates such as plastic films, replacing brittle ITO with materials and structures that can withstand bending and deformation while maintaining electrical performance
4Reliability
If cupric oxide seed layer is applied to enhance noble metal film quality, then adherence and oxidation resistance are improved, but surface roughness may increase
Solution Approach 1:
The patent optimizes the thickness parameter of the cupric oxide seed layer to a specific range (0.5-2 nm) that provides sufficient adhesion and oxidation resistance while maintaining surface smoothness, and controls the deposition conditions to achieve fine-grained structures with minimal roughness
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 resulting article achieves high transparency and electrical conductivity with low surface roughness, maintaining transparency and conductivity even as the noble metal ultra-thin film thickness varies from 1 to 5 nm.
Implementation Method 1
The present disclosure addresses those issues by disposing a seed layer of cupric oxide (CuO) having a thickness less than or equal to 1.3 nm onto a body that is transparent
Data Source
AI summary
An article comprising: (i) a body, the body comprising a material and a transmittance greater than or equal to 90% throughout an electromagnetic radiation wavelength range of 250 nm to 800 nm; and (ii) cupric oxide (CuO) in direct contact with the material of the body, the cupric oxide (CuO) comprising a thickness that is less than or equal to 1.3 nm. Also disclosed is the article further comprising: an ultra-thin metal film disposed directly on the cupric oxide (CuO). The article demonstrates a transmittance greater than or equal to 65% throughout an electromagnetic radiation wavelength range of 300 nm to 1400 nm. The ultra-thin metal film can be silver (Ag), gold (Au), copper (Cu), or platinum (Pt). The ultra-thin metal film comprises a thickness within a range of 1 nm to 5 nm. The article at the ultra-thin metal film has a sheet resistance of less than or equal to 2100 Ω/□. Additionally, a method of forming the article.