Laser Crystallization of Amorphous Metal Oxide Layers
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Solution Overview
Problem
The manufacturing process of thin-film transistors using metal oxide semiconductor channel layers often results in amorphous metal oxide layers, which lead to manufacturing issues such as leakage current, and there is a need for a method to convert these amorphous layers into crystallized forms to improve device performance.
Innovation Solution
A method involving the use of laser processes to convert amorphous metal oxide layers into crystallized metal oxide layers, where a substrate is prepared with insulation and metal oxide layers, and a silicon layer is applied on top, followed by laser annealing to crystallize the metal oxide layers, reducing the risk of thermal expansion mismatches and layer peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional high-temperature annealing methods are used to crystallize metal oxide layers, then the metal oxide layers can be converted from amorphous to crystallized form, but the process becomes time-consuming and energy-intensive with prolonged manufacturing cycles
Solution Approach 1:
The patent replaces traditional thermal field (high-temperature annealing) with a laser field to achieve crystallization. The laser provides localized, rapid energy input that converts amorphous metal oxide layers to crystallized form much faster than conventional thermal methods, thereby reducing manufacturing cycle time while maintaining crystallization quality.
Solution Approach 2:
The patent employs pulsed laser irradiation instead of continuous heating. The periodic pulse structure delivers concentrated energy in short intervals, enabling rapid crystallization without prolonged exposure, thus significantly reducing the time required for the crystallization process while achieving the desired crystal structure.
2Productivity
If laser processes are used to crystallize metal oxide layers, then the manufacturing time is reduced and energy efficiency is improved, but the process complexity increases due to additional laser equipment and process control requirements
Solution Approach 1:
The patent integrates the laser crystallization process into the existing thin-film transistor manufacturing workflow. The laser equipment serves multiple functions: it crystallizes the metal oxide semiconductor layer, can potentially treat other layers in the stack, and works within the existing deposition and processing infrastructure, thereby managing complexity through multi-functionality.
Solution Approach 2:
The patent introduces a laser beam as an intermediary energy carrier between the power source and the metal oxide layer. This intermediary enables precise, localized energy delivery without requiring direct thermal contact or complex heating apparatus, simplifying the overall system while maintaining high productivity.
3Productivity
If amorphous metal oxide layers are used in thin-film transistors, then the deposition process is simple and fast, but leakage current issues occur and device performance deteriorates
Solution Approach 1:
The patent performs laser crystallization as a preliminary step before final device assembly and testing. By crystallizing the metal oxide layer early in the manufacturing process, the material's electrical properties are improved beforehand, preventing leakage current issues from developing in subsequent device operations, thus maintaining both high deposition speed and reliable device performance.
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
This method effectively alleviates leakage current issues and enhances the performance of active device substrates by converting amorphous metal oxide layers into crystallized forms using laser processes, which is more efficient and cost-effective compared to traditional high-temperature annealing methods.
Implementation Method 1
A first laser process is performed on a portion of the silicon layer covering the first metal oxide layer such that the first metal oxide layer is converted into a first crystallized metal oxide layer
Implementation Method 2
laser annealing to crystallize the metal oxide layers
Implementation Method 3
an amorphous metal oxide layer can be converted into a crystallized metal oxide layer using laser
Data Source
AI summary
A manufacturing method of a crystallized metal oxide layer includes: providing a substrate; forming a first insulation layer on the substrate; forming a first metal oxide layer on the first insulation layer; forming a second metal oxide layer on the first insulation layer; forming a second insulation layer on the first metal oxide layer and the second metal oxide layer; forming a silicon layer on the second insulation layer; performing a first laser process on a portion of the silicon layer covering the first metal oxide layer; and performing a second laser process on a portion of the silicon layer covering the second metal oxide layer. An active device and a manufacturing method thereof are also provided.