Thin-Film Transistor Active-Layer Segmentation for Threshold Stability
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Solution Overview
Problem
Existing thin film transistors face challenges in achieving uniformity and stability of characteristics due to varying channel region lengths, which affect threshold voltage stability and positive bias temperature stability.
Innovation Solution
A thin film transistor design with an active layer divided into first and second parts, where the second part has higher conductivity and is connected to the first part, ensuring uniform carrier diffusion and maintaining semiconductor characteristics in the channel region, thereby maintaining the original channel length stability and ensuring characteristic uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the channel region length is increased to improve threshold voltage stability, then threshold voltage stability is improved, but positive bias temperature stability deteriorates
Solution Approach 1:
The active layer is segmented into multiple regions with different conductivities along the channel direction. The first region has lower conductivity and the second region has higher conductivity, creating distinct functional zones within the channel that allow simultaneous optimization of threshold voltage stability and positive bias temperature stability without requiring a longer channel length.
Solution Approach 2:
Different regions of the active layer are assigned different conductivity characteristics to perform different functions. The first region with lower conductivity provides threshold voltage stability, while the second region with higher conductivity improves positive bias temperature stability. This local differentiation of properties allows the transistor to achieve both stability requirements simultaneously.
2Stability of the object's composition
If the channel region length is increased to improve threshold voltage stability, then threshold voltage stability is improved, but characteristic uniformity deteriorates
Solution Approach 1:
The active layer is divided into multiple segments with different conductivity properties. This segmentation allows the channel to maintain a reasonable length for threshold voltage stability while creating distinct zones that promote uniform carrier distribution, thereby improving characteristic uniformity across the transistor.
Solution Approach 2:
By assigning different conductivity characteristics to different regions of the active layer, the invention creates local optimizations that ensure uniform carrier distribution throughout the channel. This local quality differentiation addresses manufacturing precision requirements while maintaining the channel length needed for stable threshold voltage.
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 ensures stable threshold voltage and reduced carrier concentration differences, enhancing the uniformity and stability of the thin film transistor characteristics while maintaining the required channel region length, thus addressing the challenges of varying channel lengths.
Implementation Method 1
carriers in the second parts can be uniformly diffused into the plurality of first sub-parts
Data Source
AI summary
A thin film transistor including: a base substrate, and an active layer and a gate on the base substrate, where the active layer includes a first part and a second part, a conductivity of the second part is greater than a conductivity of the first part; an orthographic projection of the gate on the base substrate covers an orthographic projection of the first part on the base substrate, and the orthographic projection of the gate on the base substrate does not overlap an orthographic projection of the second part on the base substrate; and the first part includes a plurality of first sub-parts, and two sides of any one first sub-part in a trend direction of the active layer are each connected to the second part.