Transparent Top Electrode Composite Film for Low-Temperature Conductivity
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Solution Overview
Problem
Existing transparent conductive films, such as ITO and ultra-thin metal films, face challenges in achieving high transmittance and conductivity suitable for organic optoelectronic devices integrated with CMOS circuits, particularly due to temperature limitations and reduced performance when used as top electrodes in organic optoelectronic devices.
Innovation Solution
A transparent top electrode composite film comprising a substrate with an MoOx film layer, a doped Ag-based film layer, and an HfOx film layer, prepared using vacuum thermal evaporation, electron beam evaporation, and sputtering processes at low temperatures, ensuring compatibility with organic active layers and enhancing transmittance and conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transparent conductive oxide films such as ITO are used as top electrodes, then conductivity is improved, but transmittance and conductivity are decreased due to process temperature limitations
Solution Approach 1:
The patent uses a composite structure consisting of MoOx layer, doped Ag-based layer, and HfOx layer. This composite material approach allows each layer to contribute different properties: MoOx provides low-temperature deposition capability, Ag-based layer provides high conductivity, and HfOx protects the Ag layer while maintaining transparency, achieving both high transmittance and conductivity at low processing temperatures
Solution Approach 2:
The patent changes the material composition parameters by doping the Ag-based layer with specific elements and controlling the stoichiometry of MoOx and HfOx layers. This parameter optimization enables the composite film to achieve high transmittance and conductivity at low processing temperatures compatible with organic optoelectronic devices
2Temperature
If ultra-thin metal films are used, then transmittance and conductivity are improved at low process temperature, but average transmittance decreases in the visible to near-infrared range
Solution Approach 1:
The patent combines ultra-thin Ag-based layer with MoOx and HfOx layers to create a composite structure. The MoOx and HfOx layers act as transparent dielectric layers that enhance the overall transmittance in the visible to near-infrared range while allowing the ultra-thin Ag-based layer to maintain low process temperature compatibility and high conductivity
Solution Approach 2:
The MoOx and HfOx layers serve as intermediary layers between the substrate and the ultra-thin Ag-based layer. These intermediary layers protect the Ag layer, enhance optical transmittance, and enable the ultra-thin metal film to achieve both high transmittance and conductivity at low processing temperatures
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 composite film achieves high average transmittance (up to 77%) and low sheet resistance (10-20 Ω/□) across visible to near-infrared light ranges, significantly improving the performance of organic optoelectronic devices while being compatible with organic active layers at temperatures below 120°C.
Implementation Method 1
vacuum thermal evaporation
Implementation Method 2
electron beam evaporation
Implementation Method 3
sputtering processes
Data Source
AI summary
A transparent top electrode composite film for organic optoelectronic devices includes a substrate, an MoOx film layer coated on the substrate, a doped Ag-based film layer coated on the MoOx film layer and an HfOx film layer coated on the doped Ag-based film layer. A preparation method of the transparent top electrode composite film, which is achieved under vacuum and low temperature, includes steps of (A) depositing an MoOx film layer on a substrate through thermal evaporation process or electron beam evaporation process without heating the substrate; (B) depositing a doped Ag-based film layer on the MoOx film layer through sputtering process or evaporation process; and (C) depositing an HfOx film layer on the doped Ag-based film layer through reactive sputtering process, thereby obtaining the transparent top electrode composite film. The composite film is able to be used as a top electrode material for organic optoelectronic devices.