Vertical Organic Transistor Doping Layer Design
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Solution Overview
Problem
Vertical organic transistors face challenges in optimizing current in the on-state, operating voltage, current amplification, and on/off ratio, which are crucial for high-speed applications like OLEDs, where precise control and high packing density are required.
Innovation Solution
A vertical organic transistor design featuring a central electrode with a doping layer between the electrode and organic layers, allowing efficient charge carrier transport, and an additional doping layer between the central and counter electrodes, enhancing current and voltage amplification by improving the subthreshold swing and maintaining high current densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a central electrode with insulating metal compound and metal particles is used, then current passage through the electrode is enabled, but device complexity increases
Solution Approach 1:
The central electrode uses a composite structure combining insulating metal compound (such as Al2O3, SiO2, or TiO2) with metal particles (such as Al, Ag, or Au). This composite material enables current passage through the electrode while maintaining the insulating properties needed for transistor operation, resolving the contradiction between enabling current flow and avoiding short circuits.
2Speed
If vertical current flow with small electrode length is used, then switching speed increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent replaces traditional mechanical lithography and electrode positioning methods with vapor deposition techniques. By depositing materials in a vacuum to form layers with precisely controlled thicknesses (e.g., 10-100 nm), the manufacturing process achieves the required precision for small electrode lengths without complex mechanical alignment, enabling fast switching while maintaining manufacturability.
3Illumination intensity
If high current density is achieved through small dimensions, then OLED brightness increases, but operating voltage remains high
Solution Approach 1:
The patent modifies the electrical parameters of the transistor by optimizing the doping concentration and layer thicknesses. By adjusting these parameters, the transistor achieves higher current gain and lower operating voltage (typically below 5 V), enabling high OLED brightness with reduced energy consumption and improved efficiency.
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 design significantly increases current density, reduces operating voltage, and enhances the on/off ratio, achieving higher current amplification and voltage amplification while maintaining low off-state currents, thus improving the overall performance of the transistor.
Implementation Method 1
a doping layer (141) which is arranged between the central electrode (122) and the electrode (121)
Implementation Method 2
a central electrode (122), which is realised to allow a passage of electrical charge carriers through the central electrode (122)
Data Source
AI summary
The invention relates to a vertical organic transistor on a substrate having an electrode, a counter electrode and a layer arrangement which is arranged between the electrode and the counter electrode, wherein the layer arrangement is formed with the following layers: a central electrode, an organic layer made up of organic semiconductor material which is arranged between the central electrode and the electrode, a further organic layer made up of organic semiconductor material, which is arranged between the central electrode and the counter electrode, and a doping layer which is arranged between the central electrode and the electrode. Furthermore, the invention relates to a method for producing a vertical organic transistor.