Organic Stack Defect Passivation via Resin Exposure
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Solution Overview
Problem
Existing organic electronic devices, such as organic solar cells and photodetectors, face issues with parasitic electrical leakage currents due to defects in the active layer, which can lead to short-circuiting and degradation of device performance, and current solutions like increasing the active layer thickness or filtration are either ineffective or impractical.
Innovation Solution
A method involving the deposition of a conductive electrode, an active layer with non-continuous zones, a resin layer, and a second conductive electrode, where the resin is used to expose and develop holes or spots at defect sites, allowing for local etching and passivation to prevent electrical leakage, while maintaining device performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the active layer is increased to reduce parasitic leakage currents, then electrical insulation is improved, but device performance degrades
Solution Approach 1:
The patent applies local quality by selectively treating only the defective zones of the active layer through local etching. Instead of uniformly increasing the thickness of the entire active layer, the method locally modifies only the areas with holes or morphological defects by removing conductive material and depositing insulating material. This targeted approach maintains the original thin structure (200-300 nm) for optimal device performance while providing electrical insulation only where parasitic leakage currents occur.
2Manufacturing precision
If filtration is applied to the solution to reduce defects, then active layer quality is improved, but the process becomes difficult to implement at industrial level
Solution Approach 1:
The patent employs preliminary action by performing defect detection and correction as integrated steps within the existing manufacturing process. The method uses optical or electrical characterization to identify defective zones, then applies local etching and insulating material deposition directly on the substrate. This approach eliminates the need for separate filtration steps before deposition, making the process suitable for industrial implementation while still achieving high active layer quality.
3Manufacturing precision
If planarizing layers are added to substrates to reduce defects, then substrate quality is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and removes only the problematic conductive material from defective zones through local etching, rather than adding planarizing layers to the entire substrate. By selectively eliminating conductive material from areas with holes or morphological defects and replacing it with insulating material, the method reduces parasitic leakage currents without requiring expensive planarizing layers, thus maintaining substrate quality while controlling manufacturing costs.
4Reliability
If local etching of the first conductive layer is performed to prevent short circuits, then electrical leakage is reduced, but the process requires complete etching which increases manufacturing complexity
Solution Approach 1:
The patent introduces an intermediary insulating material layer between the two conductive electrodes at defective zones. After local etching removes conductive material from holes or defects in the active layer, an insulating material is deposited to fill and seal these defects. This intermediary insulating layer acts as a mediator that prevents direct contact between electrodes through defective areas, ensuring reliable short circuit prevention while allowing controlled etching processes.
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 method effectively reduces parasitic leakage currents by electrically isolating defects in the active layer, enhancing the reliability and efficiency of organic electronic devices without the drawbacks of previous solutions.
Implementation Method 1
exposure of the resin layer by the rear face of said substrate
Implementation Method 2
depositing a first layer of conductive material on the front face of a substrate, to form the first electrode
Data Source
Figure 1~6
Figure 7~12
Figure 13~18
AI summary
The invention relates to a method for producing a first electrode/active layer/second electrode stack for an electronic device, in particular an organic photodetector or organic solar cell, comprising the following steps: (a) deposition of a first layer (2) of conductive material on the front face of a substrate, to form the first electrode, (b) deposition of an active layer (3), in the form of a thin organic semiconducting layer, this layer having non-continuous areas, characterized in that, this method also comprises the following steps: (d) deposition of a resin layer (4, 7) on the face of the stack opposite the substrate which is at least partially transparent, (e) insolation of the resin layer (4, 7) by the rear face (10) of said substrate, (f) development of the resin layer and (g) deposition of a second layer (5) of conductive material to form the second conductive electrode.