TFT Active Layer Integration for X-Ray Detector Performance
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Solution Overview
Problem
The existing thin film transistors in X-ray detectors require multiple patterning processes for source and drain electrode formation, leading to increased coupling capacitances and reduced performance due to larger face areas between electrodes.
Innovation Solution
The source and drain electrodes are formed in the same layer as the active layer, reducing the number of patterning processes and minimizing face areas between electrodes, thereby decreasing coupling capacitances and enhancing transistor performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If source and drain electrodes are formed by overlapping the semiconductor layer to avoid poor connection, then connection reliability is improved, but the number of patterning processes increases and device complexity increases
Solution Approach 1:
The source electrode, drain electrode, and active layer are merged into a single semiconductor layer structure. The source and drain regions are formed by doping different portions of the same semiconductor layer, eliminating the need for separate electrode layers and reducing the number of patterning processes while maintaining reliable electrical connection.
Solution Approach 2:
The semiconductor layer serves multiple functions simultaneously: it acts as the active layer for transistor operation, and also forms the source and drain electrodes through selective doping. This multi-functionality reduces the number of required layers and patterning steps while ensuring reliable electrical connections.
2Reliability
If multiple patterning processes are used for source and drain electrode formation, then connection reliability is improved, but coupling capacitances increase and transistor performance deteriorates
Solution Approach 1:
By merging the source, drain, and active layer into a single doped semiconductor structure, the invention minimizes the face area between electrodes. This reduces coupling capacitances between source and drain, improving transistor switching performance and reducing power consumption while maintaining reliable connections through the doped regions.
3Manufacturing precision
If source and drain electrodes are formed in separate layers, then manufacturing precision can be maintained, but the number of patterning processes increases and productivity decreases
Solution Approach 1:
The invention combines source, drain, and active layer formation into a single patterning process. By forming all three structures from one semiconductor layer with selective doping, the method maintains precise positioning through a single alignment step while significantly improving manufacturing efficiency by eliminating multiple sequential patterning operations.
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 approach reduces the number of patterning processes and decreases coupling capacitances, resulting in improved performance of the thin film transistor by forming source, drain, and active layers in a single layer, enhancing the overall efficiency of the X-ray detector.
Implementation Method 1
performing an ion doping process to a portion, not sheltered by the passivation shielding layer, of the semiconductor-layer thin film to form a pattern comprising a source electrode and a drain electrode
Data Source
AI summary
A TFT and manufacturing method thereof, an array substrate and manufacturing method thereof, an X-ray detector and a display device are disclosed. The manufacturing method includes: forming a gate-insulating-layer thin film (3′), a semiconductor-layer thin film (4′) and a passivation-shielding-layer thin film (5′) successively; forming a pattern (5′) that includes a passivation shielding layer through one patterning process, so that a portion, sheltered by the passivation shielding layer, of the semiconductor-layer thin film forms a pattern of an active layer (4a′); and performing an ion doping process to a portion, not sheltered by the passivation shielding layer, of the semiconductor-layer thin film to form a pattern comprising a source electrode (4c′) and a drain electrode (4b′). The source electrode (4c′) and the drain electrode (4b′) are disposed on two sides of the active layer (4a′) respectively and in a same layer as the active layer (4a′). The manufacturing method can reduce the number of patterning processes and improve the performance of the thin film transistor in the array substrate.