Oxide Thin-Film Transistor Protective Layer for Low-Heat Conduction
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Solution Overview
Problem
Existing oxide thin film transistors face low electrical conductivity due to the use of crystalline oxides in protective layers, which generates excessive heat and affects the reliability of current transmission through the channel layer.
Innovation Solution
The design includes a protective layer with distinct portions, where the first and second target portions have higher electrical conductivity than the third portion, and are made from multi-element metallic oxides or IGZOs, with specific crystalline and amorphous structures, to prevent heat generation and ensure reliable current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If crystalline oxides are used in protective layers, then protective function is provided, but electrical conductivity decreases and heat generation increases
Solution Approach 1:
The protective layer is divided into different regions with different material compositions: a first region with higher In:Ga:Zn ratio (lower conductivity) for protection, and second regions with lower In:Ga:Zn ratio (higher conductivity) for current transmission. This local differentiation allows simultaneous achievement of protective function and reduced heat generation.
Solution Approach 2:
The protective layer uses composite oxide material with varying In:Ga:Zn ratios across different regions. The composite structure combines materials with different electrical properties - high-ratio regions provide protection while low-ratio regions provide conductivity, resolving the contradiction between protective function and heat generation.
2Ease of manufacture
If uniform protective layer is used, then manufacturing is simplified, but heat generation and conductivity issues cannot be addressed
Solution Approach 1:
The protective layer uses different In:Ga:Zn ratios in different regions to address heat generation and conductivity issues. While this increases manufacturing complexity compared to uniform layers, it enables precise control over electrical properties and heat management in critical areas.
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 configuration enhances the electrical conductivity and reliability of the oxide thin film transistor by preventing heat generation in the protective layer, thus maintaining the integrity of the channel layer's conductivity.
Implementation Method 1
an electrical conductivity of a first target portion of the first portion proximal to the source electrode and an electrical conductivity of a second target portion of the second portion proximal to the drain electrode are both greater than an electrical conductivity of the third portion
Data Source
AI summary
Provided is an oxide thin film transistor, including a gate, a gate insulator, a channel layer, a protective layer, and a source electrode and drain electrode layer that are disposed on a base substrate, wherein the source electrode and drain electrode layer includes a source electrode and a drain electrode that are spaced; and the protective layer is disposed between the channel layer and the source electrode and drain electrode layer, and is in contact with both the source electrode and drain electrode layer and the channel layer; an orthographic projection of the protective layer on the base substrate covers an orthographic projection of the channel layer on the base substrate; and the protective layer includes a first portion, a second portion, and a third portion that are in different areas of the protective layer.