Solar Cell Panel Defect Detection Using Modulated Light Scanning
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Solution Overview
Problem
Existing methods for detecting defects in solar cell panels, such as cracks and short circuits, are inefficient and inaccurate for thin-film solar cells, impacting production yield and quality due to lack of inline inspection and defect checking.
Innovation Solution
A testing method and apparatus that uses ambient light and modulation light to analyze electrical properties of specific areas of solar cell panels, allowing for efficient detection of defects like short circuits by differentiating local opto-electrical responses and computing power conversion efficiency (PCE) maps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional PL or EL detection methods are used for thin-film solar cell panels, then defect detection may be performed, but the detection efficiency and accuracy are insufficient for large-format monolithic panels
Solution Approach 1:
The patent divides the large-format solar cell panel into multiple smaller detection regions that can be individually scanned. The detection system moves across different areas of the panel, collecting opto-electrical data from each region separately, which enables precise defect localization while maintaining efficient throughput for large panels.
Solution Approach 2:
The patent employs periodic modulation of the incident light to generate time-varying opto-electrical signals. By modulating the light source at specific frequencies and detecting the corresponding modulated electrical responses, the system can distinguish defect signals from background noise, significantly improving detection accuracy for thin-film panels.
2Loss of information
If small-scale PL or EL detection is applied to thin-film solar cell panels, then some defect information can be obtained, but uniformity and defect level assessment across the entire panel cannot be achieved
Solution Approach 1:
The patent creates a universal detection system that can assess multiple parameters across the entire panel including uniformity, defect levels, and power conversion efficiency. The same scanning and modulation apparatus performs comprehensive characterization of the whole panel rather than requiring separate specialized equipment for different measurement types.
Solution Approach 2:
The patent uses optical copying methods where the modulated light creates optical images of the panel regions being detected. CCD or CMOS cameras capture these optical images, which are then processed to extract defect information, enabling non-contact, full-field assessment without physically touching or damaging the thin-film panel.
3Productivity
If no inline inspection is performed on monolithically integrated solar panels, then manufacturing process continues without interruption, but quality and performance variability cannot be detected or corrected
Solution Approach 1:
The patent implements preliminary detection of defects and performance variations during the manufacturing process itself. By scanning panels at intermediate stages or upon completion before final assembly, the system identifies issues early, allowing for real-time feedback and correction that prevents defective panels from entering production, thereby protecting both quality and productivity.
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
Enables accurate and efficient detection of defects, guiding manufacturers to correct issues and improve the manufacturing process by providing detailed PCE maps and defect localization, thereby enhancing solar cell panel quality and production yield.
Implementation Method 1
solar cell panel for converting light energy into electrical power
Data Source
AI summary
A testing method of a solar cell panel of the present invention, includes steps of: (a) providing an ambient light with steady illumination to the surface of a solar cell panel to introduce a steady signal to its electrical output; (b) providing a modulation light to a given area of the solar cell panel to introduce a modulated signal to its electrical output corresponding to the given area; and (c) analyzing electrical output of the solar cell panel to obtain electrical properties corresponding to the given area. The testing method can test the solar cell panel efficiently, detect and locate defects accurately so that the defects can be corrected and feed back to improve manufacturing process.