Vertical Electro-Optical Component Gate Control via Charge Transport Layer
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Solution Overview
Problem
Existing vertical electro-optical components face challenges in achieving high reaction speed and low operational voltage due to complexities in fabrication and instability issues, such as leakage currents and poor switching characteristics.
Innovation Solution
A vertical electro-optical component is fabricated with a substrate, patterned insulating and metal layers, and a semiconductor layer that encapsulates these, along with a second electrode layer, using specific materials like ITO, poly[3-hexylthiophene-2,5-diyl], and silicon oxide, which allows for a short channel length and effective exciton detachment, reducing operational voltage and increasing response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mesh gate is fabricated in a light-emitting layer, then the component can function as a vertical light-emitting transistor, but the fabrication steps become complicated and it is difficult to control the thickness of the gate layer
Solution Approach 1:
The gate electrode is extracted from the light-emitting layer and placed in the charge transport layer instead. This separation allows the gate to be formed by simple sequential deposition without complex mesh fabrication steps, while still achieving effective gate control over the light-emitting layer through the charge transport layer interface.
Solution Approach 2:
The charge transport layer serves as an intermediary between the gate electrode and the light-emitting layer. The gate controls currents through this intermediary layer, enabling effective gate control without direct contact with the light-emitting layer, thus simplifying fabrication while maintaining functionality.
2Reliability
If the gate layer is made too thick, then it may prevent currents from flowing from source to drain, but if made too thin, then the gate cannot control the currents effectively
Solution Approach 1:
The gate layer thickness is optimized to a specific range (5-20 nm) that balances current control effectiveness and manufacturability. This parameter optimization ensures sufficient gate control while remaining compatible with standard vacuum deposition processes, avoiding the need for ultra-precise thin film control.
Solution Approach 2:
The gate control mechanism transitions from direct vertical control through a thick mesh structure to lateral control through the charge transport layer. This dimensional shift allows effective current modulation with much thinner gate layers that are easier to manufacture.
3Device complexity
If a third electrode is inserted far from the light-emitting area, then the display structure is simplified, but the light-emitting area potential becomes difficult to control and switching characteristic performs poorly
Solution Approach 1:
The charge transport layer acts as an intermediary that transmits the gate electrode's electric field influence to the light-emitting layer. This allows the gate to be positioned away from the light-emitting area while still effectively controlling the potential and achieving good switching characteristics through the intermediary layer's charge transport properties.
4Ease of manufacture
If no insulating layer is used between base and emitter or base and collector, then the fabrication process is simplified, but leakage currents occur and power loss increases
Solution Approach 1:
The charge transport layer serves as an insulating intermediary between the gate electrode and the light-emitting layer, preventing direct contact and reducing leakage currents. This intermediary layer is formed by standard deposition processes, maintaining fabrication simplicity while eliminating power loss from leakage.
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 results in a vertical photodetector with low operational voltage and high reaction speed, capable of forming an optical sensor with improved efficiency and external quantum efficiency, while also enabling a light-emitting transistor component.
Implementation Method 1
a semiconductor layer formed on the first electrode layer and encapsulating the patterned insulating layer and the metal layer
Implementation Method 2
In semiconductor-based photodetectors, photons excite movable carriers, to generate currents
Data Source
AI summary
A vertical electro-optical component and a method for forming the same are provided. The vertical electro-optical component includes a substrate, a first electrode layer formed on the substrate, a patterned insulating layer formed on the first electrode layer, a metal layer formed on the patterned insulating layer, a semiconductor layer formed on the first electrode layer, and a second electrode layer formed on the semiconductor layer, wherein the semiconductor layer encapsulates the patterned insulating layer and the metal layer. The vertical electro-optical component thus has a low operational voltage of a vertical transistor and a high reaction speed of a photo diode, and may be used to form light-emitting transistors.