Opto-Electronic Auxiliary-Electrode Partition for Mask-Free Patterning
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Solution Overview
Problem
Existing methods for depositing conductive coatings in opto-electronic devices, such as OLEDs, face challenges due to high evaporation temperatures of electrode materials, which affect the re-usability and accuracy of fine metal masks, and create debris, making them unsuitable for devices with certain topographical features.
Innovation Solution
The use of a nucleation-inhibiting coating (NIC) on a first layer surface with a conductive coating disposed on a second layer surface, where the first portion is devoid of the conductive coating, and the conductive coating is electrically coupled to a third electrode in a sheltered region of a partition, allowing for precise patterning without the need for fine metal masks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fine metal mask is used during deposition of electrode material, then the conductive coating can be deposited in a pattern, but the high evaporation temperatures affect the re-usability and accuracy of the mask
Solution Approach 1:
A nucleation-inhibiting coating is introduced as an intermediary layer between the electrode material and the substrate. This coating enables selective deposition by controlling where nucleation occurs, allowing the electrode material to be deposited in precise patterns without requiring a fine metal mask, thus resolving the contradiction between pattern accuracy and mask durability
Solution Approach 2:
The mechanical fine metal mask system is replaced with a chemical/nucleation-based patterning approach. Instead of using a physical mask that blocks deposition, the invention uses a nucleation-inhibiting coating to control where material deposits, eliminating the wear and accuracy issues associated with physical masks
2Manufacturing precision
If a laser drilling process is used to remove unwanted regions of electrode material, then the conductive coating can be patterned, but debris is created that affects manufacturing yield
Solution Approach 1:
The nucleation-inhibiting coating is applied in advance to define the desired pattern areas before electrode material deposition. This preliminary action ensures that material only deposits where intended, eliminating the need for subsequent laser drilling and the debris it generates
Solution Approach 2:
The invention converts the potential harm of uncontrolled deposition into a benefit by using the nucleation-inhibiting coating to precisely control where material deposits. This approach transforms what would otherwise require a harmful removal process (laser drilling) into a clean, additive process
3Ease of manufacture
If traditional deposition methods are used, then conductive coatings can be deposited, but the process creates debris and requires complex masking that increases manufacturing complexity
Solution Approach 1:
The complex masking step is extracted and replaced by the nucleation-inhibiting coating approach. Instead of adding a masking layer that needs to be applied and removed, the invention uses a coating that inherently controls deposition patterns, simplifying the manufacturing process
Solution Approach 2:
The nucleation-inhibiting coating performs the dual function of both protecting areas where no deposition should occur and guiding material to areas where deposition is desired. This self-service approach eliminates the need for separate masking and pattern definition steps
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
This approach enables precise and debris-free patterning of conductive coatings, improving manufacturing yield and reducing costs by avoiding the limitations of traditional methods.
Implementation Method 1
a nucleation-inhibiting coating (NIC) disposed on a first layer surface in a first portion of a lateral aspect
Data Source
AI summary
An opto-electronic device having a plurality of layers, comprising a nucleation-inhibiting coating (NIC) disposed on a first layer surface in a first portion of a lateral aspect thereof. In the first portion, the device comprises a first electrode, a second electrode and a semiconducting layer between them. The second electrode lies between the NIC and the semiconducting layer in the first portion. In the second portion, a conductive coating is disposed on a second layer surface. The first portion is substantially devoid of the conductive coating. The conductive coating is electrically coupled to the second electrode and to a third electrode in a sheltered region of a partition in the device.