Metal Oxide Layer Design for High-Resolution Display Etching
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Solution Overview
Problem
Current light-emitting devices face challenges in achieving high-resolution displays due to limitations in the dry etching process, particularly with the reflection layer and metal oxide layer, which affect the formation of electrodes with small pitches and the reliability of the metal oxide layer in wet processes.
Innovation Solution
A light-emitting device is designed with a reflection layer containing aluminum or aluminum alloys and a metal oxide layer comprising molybdenum dioxide and a group-V element oxide, such as tantalum pentoxide, optimized for dry etching, with specific atomic percentages and thicknesses to ensure high reflectance, low water solubility, and suitable for injection and transportation of holes, while preventing oxidation and damage in subsequent processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional reflection layer and metal oxide layer structure is used, then the device structure is simple, but the manufacturing precision and reliability deteriorate due to limitations in dry etching process and oxidation damage in wet processes
Solution Approach 1:
The reflection layer is divided into multiple layers with different materials (aluminum layer, aluminum alloy layer) and the metal oxide layer is segmented into multiple sub-layers (first metal oxide layer, second metal oxide layer). This segmentation allows each layer to be optimized for specific functions such as dry etching compatibility and oxidation prevention, thereby improving manufacturing precision without excessive complexity increase.
Solution Approach 2:
The patent employs composite material structures where the reflection layer combines aluminum with other metals (e.g., nickel, lanthanum) and the metal oxide layer uses combinations of different metal oxides (e.g., molybdenum oxide, tantalum oxide, niobium oxide). These composite structures provide enhanced properties including improved dry etching performance, reduced water solubility, and better oxidation resistance, resolving the contradiction between manufacturing precision and structural simplicity.
2Reliability
If the metal oxide layer is made highly resistant to oxidation, then reliability improves, but the ease of manufacture deteriorates due to restricted material selection and process complexity
Solution Approach 1:
An organic layer is introduced as an intermediary between the metal oxide layer and the light-emitting layer. This intermediary layer serves multiple functions: it prevents oxidation of the metal oxide layer during wet processing, maintains reliability, and simultaneously simplifies manufacturing by providing a protective barrier that eliminates the need for complex oxidation prevention measures in subsequent processing steps.
Solution Approach 2:
The patent optimizes specific parameters of the metal oxide layer including thickness (50-200 nm), composition ratios (e.g., Mo:Ta:Nb in 4:3:2 or 3:2:1), and oxidation states. By carefully controlling these parameters, the metal oxide layer achieves high oxidation resistance and reliability while remaining compatible with standard manufacturing processes, thus resolving the contradiction between reliability and ease of manufacture.
3Measurement precision
If the pitch of electrodes is reduced for high resolution, then display resolution improves, but the reliability deteriorates due to difficulties in dry etching process
Solution Approach 1:
The reflection layer and metal oxide layer are engineered with specific parameter optimizations including thickness control (reflection layer: 50-200 nm, metal oxide layer: 50-200 nm), composition ratios, and material selection. These parameter changes enhance the layers' resistance to dry etching, enabling reliable fabrication of electrodes with small pitches for high-resolution displays while maintaining process reliability.
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 enables the production of high-resolution display panels with low failure rates by ensuring uniform reflectance, preventing oxidation, and maintaining the integrity of the metal oxide layer, thereby improving the overall performance and reliability of the light-emitting device.
Implementation Method 1
a first electrode including a reflection layer and a metal oxide layer on the reflection layer
Implementation Method 2
suitable for injection and transportation of holes
Data Source
AI summary
A light-emitting device may include a first electrode, a second electrode, and a light-emitting layer therebetween. The first electrode may include a reflection layer and a metal oxide layer provided on the reflection layer. The metal oxide layer may be provided between the reflection layer and the light-emitting layer. The metal oxide layer may include molybdenum dioxide and an oxide of a group-V element, and a content of the group-V element to a total amount of the metal oxide layer may range from 2 at % to 10 at.