TFT Contact Interface Layer to Prevent Plasma-Induced Oxygen Vacancies
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Solution Overview
Problem
Conventional semiconductor device manufacturing methods using chemical vapor deposition (CVD) or physical vapor deposition (PVD) generate oxygen vacancies on the active layer surface due to plasma damage, leading to decreased reliability and performance of thin film transistors.
Innovation Solution
A protective interface layer is formed on the contact surfaces of the active layer using plasma treatment or deposition methods, such as PVD or ALD, with materials like zinc oxide, gallium oxide, or titanium nitride to prevent plasma damage and reduce oxygen vacancy generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If CVD or PVD is used to generate contact regions of source and drain electrodes, then the contact regions can be formed, but oxygen vacancies are generated on the active layer surface due to plasma damage
Solution Approach 1:
A protective interface layer is introduced as an intermediary between the active layer and the source/drain electrodes. This layer prevents direct contact and plasma damage from CVD/PVD processes to the active layer surface, thereby avoiding oxygen vacancy generation while still allowing electrical contact to be established through the protective layer.
Solution Approach 2:
The protective interface layer is formed on the active layer surface before the CVD or PVD process is performed. This preliminary protective action ensures that when plasma is subsequently applied for contact region formation, the active layer is already shielded and cannot suffer plasma damage or oxygen vacancy generation.
2Ease of manufacture
If CVD or PVD is used to generate contact regions, then contact regions can be formed, but plasma damage occurs to the active layer surface
Solution Approach 1:
The protective interface layer serves as a mediator that absorbs or blocks the harmful plasma effects during CVD or PVD processes. The plasma interacts with the protective layer instead of directly damaging the active layer surface, allowing contact region formation to proceed without harmful side effects.
Solution Approach 2:
The protective interface layer is deposited beforehand to cushion or absorb the impact of plasma during subsequent CVD or PVD processes. This pre-established protective barrier prevents plasma damage to the active layer while still permitting the necessary contact region formation.
3Device complexity
If no protective layer is used, then the manufacturing process is simpler, but oxygen vacancies are generated leading to decreased electrical stability
Solution Approach 1:
The protective interface layer acts as an intermediary that stabilizes the active layer composition during device operation. It prevents oxygen diffusion and maintains the integrity of the active layer under gate bias stress, thereby ensuring electrical stability despite the added manufacturing step.
Solution Approach 2:
The protective interface layer changes the physical and chemical parameters at the interface between the active layer and electrodes. By modifying the interface composition and properties, it prevents oxygen vacancy formation and maintains stable electrical characteristics under operating conditions.
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 protective interface layer enhances the electrical stability and reliability of the semiconductor device by inhibiting oxygen vacancy formation under gate bias stress, thereby improving carrier mobility and reducing threshold voltage shifts.
Implementation Method 1
the two contact surfaces are subjected to a plasma treatment or a deposition treatment to form a protective interface layer
Implementation Method 2
deposition methods, such as PVD or ALD
Implementation Method 3
deposition methods, such as PVD or ALD
Data Source
AI summary
A semiconductor device and a manufacturing method thereof are provided. The semiconductor device includes a gate electrode, a gate insulating layer, an active layer, a dielectric layer, a source electrode, and a drain electrode. The gate insulating layer is disposed between the gate electrode and the active layer, the dielectric layer is disposed on a side of the active layer, and the source electrode and the drain electrode pass through the dielectric layer to electrically connect with the active layer, wherein a first contact surface is formed between the source electrode and the active layer, a second contact surface is formed between the drain electrode and the active layer, the first contact surface and the second contact surface are subjected to a plasma treatment or a deposition treatment to form a protective interface layer.