Floating Dummy Oxide Semiconductor Layer for Transistor Stability
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Solution Overview
Problem
Oxide semiconductor transistors in display devices face degradation due to insufficient oxidation of the channel forming region, caused by oxygen extraction from the semiconductor layer by metal lines, leading to shifted threshold values and poor switching characteristics.
Innovation Solution
Incorporating a dummy oxide semiconductor layer that is electrically floating and disposed close to the transistor, which supplies oxygen to prevent deoxidization of the semiconductor layer, thereby reducing oxygen extraction and maintaining transistor stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal lines are disposed close to the oxide semiconductor layer, then electrical connection and signal transmission are achieved, but oxygen is extracted from the semiconductor layer causing threshold value shift and poor switching characteristics
Solution Approach 1:
A dummy oxide semiconductor layer is introduced as an intermediary between the metal lines and the functional oxide semiconductor layer. This dummy layer acts as a buffer that supplies oxygen to prevent oxygen extraction from the functional layer, thereby maintaining transistor switching characteristics while allowing metal lines to be disposed close to the semiconductor structure for electrical connection.
Solution Approach 2:
The dummy oxide semiconductor layer is formed in advance during the manufacturing process, specifically after forming the oxide semiconductor layer and before disposing metal lines. This preliminary formation ensures that oxygen supply capability is established before oxygen extraction by metal lines occurs, preventing threshold value shift and maintaining reliable switching characteristics.
2Stability of the object's composition
If the oxide semiconductor layer is sufficiently oxidized, then transistor threshold values remain stable, but manufacturing complexity increases due to additional oxidation processes
Solution Approach 1:
The dummy oxide semiconductor layer serves as a self-sustaining oxygen reservoir that automatically supplies oxygen to the functional oxide semiconductor layer during device operation and storage. This self-service mechanism maintains the oxidation state of the functional layer without requiring continuous external oxidation processes, thereby stabilizing transistor threshold values while avoiding additional manufacturing complexity.
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 dummy oxide semiconductor layer effectively suppresses oxygen extraction, maintaining the stability and performance of oxide semiconductor transistors, ensuring long-term retention of electric charge and desired voltage in display devices.
Implementation Method 1
a dummy oxide semiconductor layer that is electrically floating and disposed close to the transistor, which supplies oxygen to prevent deoxidization of the semiconductor layer
Data Source
AI summary
According to one embodiment, a semiconductor layer includes a base, a scanning line disposed over the base, a signal line disposed over the base, a transistor overlapping the scanning line and the signal line and including a first oxide semiconductor layer connected to the signal line, and second oxide semiconductor layers disposed in a same layer as the first oxide semiconductor layer. The second oxide semiconductor layers are disposed around the transistor, and the second oxide semiconductor layers are floating.