Metal-Oxide TFT Lanthanide Diffusion for Light Stability

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Solution Overview

Problem

The stability of the active layer in metal-oxide thin-film transistors (TFTs) is poor, leading to issues with light stability.

Innovation Solution

A method involving the formation of an active layer with a metal oxide semiconductor and a functional layer containing a lanthanide element, followed by annealing to diffuse the lanthanide element into the active layer, forming a trap state that captures photo-generated electrons.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional active layer structure is used, then the manufacturing process is simple, but the light stability is poor

Engineering Contradiction:

Improvelight stabilityVSAvoidlayer structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by forming a functional layer containing lanthanide elements before the active layer, and performing annealing treatment in advance to diffuse lanthanide elements into the active layer. This preliminary preparation creates trap states that capture photo-generated electrons, thereby improving light stability before the device operates

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent introduces a functional layer containing lanthanide elements as an intermediary between the base substrate and the active layer. This intermediary layer serves as a source of lanthanide elements that diffuse into the active layer to form trap states, mediating the improvement of light stability without requiring direct modification of the active layer composition

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If annealing treatment is performed to diffuse lanthanide elements, then the illuminance stability improves, but the manufacturing time increases

Engineering Contradiction:

Improveilluminance stabilityVSAvoidannealing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies parameter changes by optimizing the annealing temperature range (400-700°C) and time duration (0.5-3 hours) to achieve effective diffusion of lanthanide elements into the active layer. By carefully controlling these parameters, the patent achieves sufficient illuminance stability improvement while minimizing the annealing time and energy consumption

Inventive Principle:

Principle #35Parameter changes

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

Improves the light stability of the active layer by reducing the number of photo-generated electrons, enhancing the illuminance stability of the metal-oxide TFT.

Implementation Method 1

annealing the active layer and the functional layer, such that the lanthanide element in the functional layer is diffused into the active layer

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS12581706B2Metal-oxide thin-film transistor and method for manufacturing same, x-ray detector, and display panel

Publication Date: 2026.03.17 BOE TECHNOLOGY GROUP CO LTD

AI summary

Provided is a method for manufacturing a metal-oxide thin-film transistor (TFT). The method includes: forming, on a base substrate, an active layer including a metal oxide semiconductor, and a functional layer laminated on the active layer and containing a lanthanide element; and annealing the active layer and the functional layer, such that the lanthanide element in the functional layer is diffused into the active layer.