Semiconductive Oxide Layer Cl2/O2 Dry Etch for TFT Consistency
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Solution Overview
Problem
Conventional thin film transistor (TFT) arrays in flat panel displays, particularly those using amorphous silicon, suffer from low charge mobility and inconsistent semiconductive characteristics, which affect the performance and reliability of the displays.
Innovation Solution
A thin film transistor array panel is designed with a semiconductive oxide layer treated using a Cl2/O2 dry etch recipe, incorporating elements like gallium, hafnium, tin, zinc, and indium, and featuring varying atom content ratios and thicknesses to enhance consistency and charge mobility, along with specific electrode and passivation layer structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amorphous silicon is used as semiconductive material, then manufacturing is easier and cost is lower, but charge mobility is low and semiconductive characteristics are inconsistent
Solution Approach 1:
The patent changes the material parameter from amorphous silicon to semiconductive oxide (such as IGZO - indium gallium zinc oxide), which fundamentally alters the semiconductive characteristics to achieve higher charge mobility and better consistency while maintaining compatibility with existing manufacturing processes
Solution Approach 2:
The patent employs composite oxide materials containing multiple elements (indium, gallium, zinc, oxygen) in specific ratios. This composite structure enables tuning of semiconductive properties to achieve both high charge mobility and manufacturing feasibility
2Manufacturing precision
If semiconductive oxide layer is treated with Cl2/O2 dry etch recipe, then semiconductive characteristics consistency is improved, but manufacturing process complexity increases
Solution Approach 1:
The Cl2/O2 dry etch recipe acts as an intermediary treatment step that modifies the surface of the semiconductive oxide layer, creating a more consistent semiconductive interface without requiring fundamental changes to the overall manufacturing process
Solution Approach 2:
The etch recipe changes the surface composition and structure of the semiconductive oxide layer by controlling chlorine and oxygen incorporation, which directly improves charge mobility and characteristic consistency
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 achieves substantially consistent semiconductive characteristics and improved reliability of thin film transistors, enhancing the performance and consistency of the TFT array panel, particularly in liquid crystal displays.
Implementation Method 1
The semiconductive oxide layer is one treated with a Cl2/O2 dry etch recipe such that the semiconductive oxide layer thereafter includes trace amounts of Cl
Data Source
AI summary
A thin film transistor array panel includes: a substrate; a gate line disposed on the substrate and including a gate electrode; a gate insulating layer disposed on the gate line; an semiconductive oxide layer disposed on the gate insulating layer; a data line disposed on the semiconductive oxide layer and including a source electrode; a drain electrode facing the source electrode on the semiconductive oxide layer; and a passivation layer disposed on the data line. The semiconductive oxide layer is patterned with chlorine (Cl) containing gas which alters relative atomic concentrations of primary semiconductive characteristic-providing elements of the semiconductive oxide layer at least at a portion where a transistor channel region is defined.