Array Substrate Protection Region for Polysilicon Lattice Stability
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Solution Overview
Problem
The existing array substrate faces challenges with increased carrier mobility of the polysilicon layer due to lattice damage from high-energy ion injection, which affects the reliability of thin-film transistor devices.
Innovation Solution
A manufacturing method for an array substrate that includes forming a fluorine-containing protection layer on the active layer using plasma doping of the gate insulating layer, preventing hydrogen atoms from entering the doped region during the hydrogenation process and maintaining lattice defects to reduce carrier mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-energy ion injection is performed on the polysilicon layer to repair lattice damage, then carrier mobility is improved, but the polysilicon lattice is damaged and impurities enter the active place
Solution Approach 1:
The patent applies preliminary action by performing low-energy ion injection before the main high-energy ion injection process. This preliminary low-energy injection prepares the polysilicon lattice by reducing initial damage and creating a more favorable state for subsequent high-energy injection, thereby allowing the lattice repair benefits while minimizing the harmful lattice damage and impurity incorporation that would otherwise occur
Solution Approach 2:
The patent applies local quality by using selective masking techniques to apply ion injection only to specific regions of the polysilicon layer. The mask layer prevents ion injection in certain areas while allowing it in others, enabling localized lattice repair where needed while protecting other regions from damage. This spatial differentiation allows the system to achieve carrier mobility improvement in critical regions without subjecting the entire polysilicon layer to harmful high-energy injection
2Reliability
If hydrogenation process is performed to fill unbonded bonds with hydrogen atoms, then carrier mobility increases, but hydrogen atoms may enter the doped region and increase carrier mobility excessively
Solution Approach 1:
The patent applies the intermediary principle by introducing a barrier layer between the hydrogenation process and the doped region. This barrier layer acts as a mediator that allows beneficial hydrogen atoms to reach the polysilicon layer for carrier mobility improvement while blocking hydrogen atoms from entering the doped region. The barrier layer thus mediates the hydrogenation process to achieve the desired effect without the harmful side effect of excessive hydrogen intrusion
Solution Approach 2:
The patent applies preliminary anti-action by performing a pre-hydrogenation process at lower temperature or with controlled parameters before the main hydrogenation step. This preliminary hydrogenation fills some unbonded bonds without creating excessive hydrogen pressure that would drive hydrogen atoms into the doped region. By anti-acting against the potential harm of hydrogen intrusion through controlled preliminary treatment, the system achieves carrier mobility improvement while preventing excessive hydrogen entry into sensitive doped regions
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 fluorine-containing protection layer effectively prevents hydrogen atoms from entering the doped region, reducing carrier mobility and enhancing the reliability of thin-film transistor devices by acting as a buffer against lattice defects.
Implementation Method 1
performing a second doping process to the gate insulating layer to make the gate insulating layer corresponding to the first region to form a first protection region and make the gate insulating layer corresponding to the second region to form a second protection region
Implementation Method 2
doping the gate insulating layer with plasma containing fluorine to make the gate insulating layer corresponding to the first region to form a first protection region containing fluorine
Implementation Method 3
The hydrogenation process fills unbonded bonds or unsaturated bonds of polysilicon atoms with hydrogen atoms to reduce numbers of unsteady states, thereby increasing carrier mobility of the polysilicon
Data Source
AI summary
An array substrate and a manufacturing method thereof, wherein the array substrate includes a substrate; an active layer disposed on the substrate; a gate insulating layer disposed on the active layer; a gate disposed on the gate insulating layer; and a protection region dispose between the active layer and the gate, wherein the protection region is disposed on two sides of the gate and disposed on a same layer as the gate insulating layer.