Double-Layer Oxide Semiconductor for High-Mobility TFT Arrays
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Solution Overview
Problem
Current thin film transistor array panels face limitations in achieving high performance due to low charge mobility in amorphous silicon and high cost, low uniformity, and complexity in manufacturing large-sized panels using polysilicon.
Innovation Solution
A thin film transistor array panel is developed with a double-layer oxide semiconductor structure, where the second layer is doped with silicon having a lower standard electrode potential than gallium, enhancing charge mobility and reliability, and formed using a sputtering method with a single target, simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If amorphous silicon is used as the semiconductor, then the manufacturing cost is low and the process is simple, but the charge mobility is low which limits thin film transistor performance
Solution Approach 1:
The patent uses a composite oxide semiconductor structure consisting of an In-Ga-Zn-O layer and an In-Sn-O layer. This composite structure combines the advantages of different oxide semiconductors to achieve high charge mobility while maintaining low manufacturing cost and simplicity, resolving the contradiction between ease of manufacture and charge mobility.
2Reliability
If polysilicon is used as the semiconductor, then the charge mobility is high enabling high performance thin film transistors, but the manufacturing cost is high and uniformity is low making large-sized panel production difficult
Solution Approach 1:
The patent changes the material parameter from polysilicon to oxide semiconductor (In-Ga-Zn-O and In-Sn-O composite structure). This material substitution maintains high charge mobility comparable to polysilicon while significantly reducing manufacturing cost and improving uniformity for large-sized panel production.
Solution Approach 2:
The patent applies a dual-layer oxide semiconductor structure where the In-Ga-Zn-O layer provides baseline semiconductor properties and the In-Sn-O layer enhances charge mobility. This local optimization of material composition in different layers achieves high performance while maintaining manufacturing feasibility.
3Ease of manufacture
If a single-layer oxide semiconductor is used, then the manufacturing process is simple, but the charge mobility and reliability are insufficient for high performance applications
Solution Approach 1:
The patent segments the oxide semiconductor into two functional layers: an In-Ga-Zn-O semiconductor layer and an In-Sn-O semiconductor layer. This segmentation allows each layer to contribute specific properties, with the In-Sn-O layer providing enhanced charge mobility through silicon doping, thereby improving overall reliability while maintaining relatively simple manufacturing.
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 solution provides improved reliability and charge mobility while reducing manufacturing complexity and costs, enabling the production of high-performance thin film transistor array panels suitable for large-scale displays.
Implementation Method 1
formed using a sputtering method with a single target
Data Source
AI summary
An exemplary embodiment provides a thin film transistor array panel, including: a substrate; an oxide semiconductor layer disposed on the substrate; an insulating layer disposed on the oxide semiconductor layer; and a pixel electrode disposed on the insulating layer. The oxide semiconductor layer includes a first layer and a second layer disposed on the first layer, the second layer includes an oxide semiconductor including silicon, and the second layer contacts the insulating layer.