Oxide Thin Film Transistor Active Region Extension
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Solution Overview
Problem
Existing oxide thin film transistors in bottom gate structures face challenges in forming an active region that efficiently overlaps with the source and drain, leading to reduced channel formation efficiency and suboptimal electrical characteristics.
Innovation Solution
The oxide thin film transistor design includes a gate insulation layer with a multi-layered structure, where the active region extends under the source and drain, and the gate insulation layer consists of materials with different etching characteristics, allowing for precise etching and formation of the active region between the source and drain, enhancing channel formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the active region is formed only between source and drain without extending under them, then the gate insulation layer structure is simpler, but the electrical characteristics and channel formation efficiency are reduced
Solution Approach 1:
The gate insulation layer is divided into multiple layers with different etching characteristics (first gate insulation layer with higher etching resistance, second gate insulation layer with lower etching resistance). This segmentation allows selective etching to form the active region that extends under the source and drain, improving electrical characteristics without requiring complete restructuring of the entire gate insulation layer.
Solution Approach 2:
Different regions of the gate insulation layer are given different etching resistance properties through the multi-layer structure. The first gate insulation layer provides protection in regions where the active region should not extend, while the second gate insulation layer allows etching in regions where the active region should extend under the source and drain, achieving local optimization of the active region formation.
2Productivity
If the active region extends under source and drain, then channel formation efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The gate insulation layer is pre-structured into multiple layers with different etching characteristics before the active region formation process. This preliminary action of creating the multi-layer structure with distinct etching properties enables subsequent selective etching to proceed more easily and precisely, reducing the actual etching precision requirements while achieving the desired active region extension under source and drain.
Solution Approach 2:
The etching resistance parameter of the gate insulation layer is changed by introducing a multi-layer structure with materials having different etching characteristics. This parameter change allows the etching process to automatically differentiate between regions, forming the active region with precise boundaries without requiring extremely tight process control, thus improving channel formation efficiency while managing manufacturing precision requirements.
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 design improves the electrical characteristics of the oxide thin film transistor by increasing the overlap of the electric field with the source and drain, facilitating easier channel formation and enhancing the transistor's performance in display and memory devices.
Implementation Method 1
the gate insulation layer consists of materials with different etching characteristics, allowing for precise etching and formation of the active region between the source and drain
Data Source
AI summary
Example embodiments are directed to oxide thin film transistors and methods of manufacturing the oxide thin film transistors. The oxide thin film transistor includes an active region in a gate insulation layer and under a source and a drain in a bottom gate structure, thus improving electrical characteristics of the oxide thin film transistor.