Solar Cell Substrate Corner Notch for Orientation Identification
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Solution Overview
Problem
The challenge in manufacturing solar cells is identifying and maintaining the correct orientation of the substrate throughout the process, which leads to inconsistencies and potential failures in the solar cell production, especially after the antireflective coating is formed, as visual discrimination of diffusion layers becomes impossible and laser marking can distort the substrate.
Innovation Solution
The substrate is modified with a flat chamfer or notch at one corner, allowing for easy identification and alignment, even after antireflective coating is applied, by using these features to determine the substrate's direction and discriminate front and back surfaces, thus ensuring consistent substrate orientation throughout the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If laser marking is used to identify substrate orientation, then substrate direction can be identified, but substrate distortion occurs and properties are degraded
Solution Approach 1:
The substrate is pre-modified with a flat chamfer or notch at one corner before any coating or processing steps. This preliminary geometric modification provides permanent orientation identification that survives all subsequent manufacturing steps without requiring additional marking operations that could damage the substrate.
2Loss of information
If visual discrimination of diffusion layers is used to identify substrate direction, then orientation can be determined, but this becomes impossible after antireflective coating is formed
Solution Approach 1:
The flat chamfer or notch is created on the substrate before any coating steps, establishing permanent orientation markers that remain visible and functional throughout the entire manufacturing process, including after antireflective coating application.
Solution Approach 2:
The geometric feature (flat chamfer or notch) creates a physical copy or representation of the substrate's orientation reference that can be visually detected at any stage of manufacturing without requiring the original diffusion layer pattern.
3Reliability
If no orientation markers are provided on the substrate, then the substrate surface remains clean and undistorted, but direction identification and alignment become difficult leading to manufacturing inconsistencies
Solution Approach 1:
A flat chamfer or notch is provided at one specific corner of the substrate, creating an asymmetric geometric feature that enables immediate visual identification of substrate orientation and corner differentiation, thereby facilitating correct alignment during manufacturing processes.
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 enables easy identification and alignment of the substrate, reducing failures associated with orientation errors and allowing for high-yield solar cell production by visually distinguishing the substrate's direction and surfaces, even in complex manufacturing steps.
Implementation Method 1
The substrate is modified with a flat chamfer or notch at one corner, allowing for easy identification and alignment, even after antireflective coating is applied, by using these features to determine the substrate's direction and discriminate front and back surfaces
Data Source
Figure 1A~2B
Figure 3A~3I
AI summary
Provided is a substrate for a solar cell, wherein a flat chamfered portion is formed on one corner of a silicon substrate having a square shape in a planar view, or a notch is formed on the corner or close to the corner. This invention makes it possible to easily check the position of the substrate and determine the direction of the substrate in a solar cell manufacturing step, and suppresses failures generated due to the direction of the substrate.