Hydrogen Trap Layer for Oxide Transistor Stability
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Solution Overview
Problem
Conventional oxide thin film transistors in LTPO display technology are prone to degradation due to hydrogen diffusion from adjacent layers, leading to reliability issues, threshold voltage shifts, and display malfunctions such as color shift and luminance non-uniformity.
Innovation Solution
Incorporation of hydrogen trap layers, typically made of metals like Li, Sc, Y, La, Ce, Ti, Zr, V, Nb, or Ta, or their alloys, into the gate or source/drain layers of oxide transistors to shield against hydrogen diffusion, and the use of dummy subpixels and modulated gate widths to manage hydrogen diffusion across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional oxide thin film transistors are used in LTPO display technology, then the display can be manufactured with standard processes, but hydrogen diffusion from adjacent layers causes degradation, threshold voltage shifts, and display malfunctions
Solution Approach 1:
A hydrogen trap layer is introduced as an intermediary component between the oxide transistor channel and the hydrogen-containing adjacent layers. This trap layer selectively captures hydrogen atoms before they can diffuse into the transistor channel, thereby preventing degradation while maintaining compatibility with standard LTPO manufacturing processes
Solution Approach 2:
The invention converts the harmful hydrogen diffusion into a beneficial process by designing the trap layer to actively attract and capture hydrogen atoms. The trap layer materials are specifically selected to have high hydrogen affinity, transforming the harmful hydrogen presence into a controlled interaction that protects the transistor
2Reliability
If hydrogen trap layers are added to oxide transistors, then hydrogen diffusion is reduced and transistor stability is improved, but device complexity increases
Solution Approach 1:
The gate structure is segmented into multiple layers, with the hydrogen trap layer positioned between the gate electrode and the semiconductor channel. This segmentation allows the trap layer to function as a distinct protective component while integrating seamlessly into the existing transistor architecture
Solution Approach 2:
The trap layer is designed to serve multiple functions: it acts as a hydrogen barrier, maintains electrical insulation between gate and channel, and can be integrated with existing gate dielectric layers. This multi-functionality reduces the need for additional separate protective structures
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 hydrogen trap layers effectively control and reduce hydrogen diffusion, enhancing the stability and reliability of oxide transistors, preventing threshold voltage shifts and maintaining display performance over the product lifetime.
Implementation Method 1
hydrogen trap layers, typically made of metals like Li, Sc, Y, La, Ce, Ti, Zr, V, Nb, or Ta, or their alloys, into the gate or source/drain layers of oxide transistors to shield against hydrogen diffusion
Data Source
AI summary
Display panels with hydrogen trap layers are described. The hydrogen trap layers may be incorporated into a variety of locations to getter or block hydrogen diffusion into the semiconductor oxide layer of an oxide transistor.