Thin Film Transistor Channel Layer with Conductor and Semiconductor Segments
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Solution Overview
Problem
Conventional thin film transistors (TFTs) have limitations in electron mobility due to the use of semiconductive materials for the channel layer, which affects their conductivity and sensitivity.
Innovation Solution
A TFT design incorporating a channel layer formed by a combination of a conductor layer and a semiconductive layer, where the conductor layer enhances electron mobility and conductivity, promoting better current flow between the source and drain, and a manufacturing method involving specific layer formation and etching processes to achieve this configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a semiconductive layer is used as the channel layer, then the TFT can be manufactured with conventional processes, but the electron mobility and conductivity are limited
Solution Approach 1:
The channel layer is constructed as a composite structure combining a conductor layer and a semiconductive layer. The conductor layer provides high electron mobility and conductivity, while the semiconductive layer maintains compatibility with conventional TFT manufacturing processes. This composite approach resolves the contradiction by achieving superior electrical properties without requiring entirely new manufacturing methodologies.
Solution Approach 2:
The channel layer is divided into two distinct functional segments: a conductor layer for high electron mobility and a semiconductive layer for process compatibility. This segmentation allows each layer to perform its specialized function, with the conductor layer enhancing electrical properties and the semiconductive layer enabling conventional manufacturing processes to be used.
2Reliability
If a combination of conductor layer and semiconductive layer is used, then electron mobility and conductivity are improved, but the device structure becomes more complex
Solution Approach 1:
The conductor layer and semiconductive layer are merged into a single integrated channel layer structure that functions as one cohesive component. This merging approach improves conductivity while avoiding the complexity of treating them as separate, independently managed components. The combined structure simplifies device fabrication and integration despite the multi-layer composition.
3Manufacturing precision
If conventional etching processes are used for patterning, then the manufacturing process is simpler, but the precision and control of the channel layer formation are limited
Solution Approach 1:
A photoresist layer is applied beforehand to the conductor layer before etching, serving as a preliminary patterning mask. This preliminary action enables precise definition of the channel layer geometry before the actual etching process, achieving high manufacturing precision while managing process complexity through systematic preparation 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
The proposed TFT design achieves improved electron mobility and sensitivity by leveraging the higher conductivity of the conductor layer, outperforming traditional TFTs with solely semiconductive channel layers, and simplifies the manufacturing process through shared photo etching and etching techniques.
Implementation Method 1
a patterned photoresist layer is formed on the conductive material layer
Implementation Method 2
a source and a drain are formed and coupled at opposite sides of the semiconductive pattern layer
Implementation Method 3
a semiconductor layer composed of a first portion and a second portion is formed by removing a portion of the semiconductive pattern layer between the source and the drain
Data Source
AI summary
A thin film transistor (TFT) includes a gate, a gate insulation layer, a channel, a source, and a drain. The gate is formed on a substrate. The gate insulation layer covers the gate and the substrate. The channel layer is formed on the gate insulation layer to correspond with the gate. The source and a drain are respectively coupled at opposite sides of the channel layer. The channel layer includes a conductor layer and a semiconductor layer. The semiconductor layer includes a first portion and a second portion respectively coupled at opposite sides of the conductor layer.