Laser Crystallization Reflection Unit for Energy Efficiency
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Solution Overview
Problem
Conventional laser crystallization devices have low energy utilization efficiency for polycrystalline silicon formation, leading to increased operational costs and potential damage to components due to high reflectance and oscillation instability.
Innovation Solution
A laser crystallization device with a reflection unit comprising multiple mirrors that re-irradiate the reflected laser beam onto the target film through different paths, increasing energy utilization and reducing the energy reflected back to the laser oscillator, thereby enhancing crystallization efficiency and minimizing component damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional laser crystallization devices irradiate laser beam directly on target film, then crystallization process is simple, but energy utilization efficiency is low due to high reflectance
Solution Approach 1:
The patent converts the harmful reflected laser beam into a beneficial resource by redirecting it back onto the target film through reflection mirrors. The reflected beam, which would normally be lost, is now reused to provide additional crystallization energy, transforming energy loss into energy utilization.
Solution Approach 2:
The patent introduces reflection mirrors as intermediary components to redirect the reflected laser beam. These mirrors act as mediators between the target film and the laser beam path, enabling the reflected beam to be redirected and reused without requiring complex system redesign.
2Reliability
If reflected laser beam is not managed, then device structure is simple, but component damage occurs due to oscillation instability and high reflectance
Solution Approach 1:
The patent converts the potentially harmful oscillating reflected beam into a stable process by redirecting it through mirrors. The reflected beam that would cause instability and component damage is now controlled and reused, transforming a reliability risk into a stable crystallization enhancement.
Solution Approach 2:
The patent creates a feedback loop where the reflected laser beam is redirected back onto the target film and then reflected again, allowing controlled multiple passes. This feedback mechanism ensures stable energy delivery while preventing uncontrolled oscillations that could damage components.
3Productivity
If reflected laser beam is re-irradiated multiple times through different paths, then energy utilization rate increases, but device complexity increases
Solution Approach 1:
The patent converts the single-use reflected beam into a multi-use resource by implementing a reflection unit with multiple mirrors. The beam that would normally be discarded after one reflection is now redirected through multiple paths to irradiate the target film several times, significantly improving crystallization efficiency.
Solution Approach 2:
The reflection unit serves multiple functions: it redirects the reflected beam, creates multiple irradiation paths, enables repeated crystallization passes, and prevents beam loss. This multi-functional component increases productivity without proportionally increasing overall system complexity.
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 device achieves a higher energy utilization rate for crystallization, reducing operational costs and minimizing damage to components by effectively re-directing and canceling reflected laser beams, thus improving the overall efficiency and stability of the crystallization process.
Implementation Method 1
a laser oscillator configured to irradiate an incident laser beam on the target film
Implementation Method 2
The incident laser beam is reflected from the target film to generate a reflected laser beam
Implementation Method 3
The reflection unit is configured to re-irradiate the reflected laser beam on the target film two or more times through a plurality of paths
Data Source
AI summary
A laser crystallization device includes a laser oscillator, a stage, and a reflection unit. The stage is configured to support a substrate with a target film disposed on the substrate. The laser oscillator is configured to irradiate an incident laser beam on the target film. The stage is configured to move the substrate such that the incident laser beam scans the target film. The incident laser beam is reflected from the target film to generate a reflected laser beam. The reflection unit includes at least two reflection mirrors positioned at a path of the reflected laser beam. The reflection unit is configured to re-irradiate the reflected laser beam on the target film two or more times through a plurality of paths that are different from a path of the incident laser beam.