Solar Module PL Evaluation with Light-Blocking Member
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Solution Overview
Problem
There is a need for an effective method to evaluate solar cells incorporated into a solar module after they have been modularized.
Innovation Solution
A photoluminescence (PL) evaluation method is used, where a solar cell is illuminated with light from a light source, and the intensity of the photoluminescent light emitted is detected, with a light-blocking member ensuring that light does not incident on other parts of the solar module, allowing for accurate evaluation of individual solar cells within the module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PL evaluation is performed on all solar cells in a solar module, then defect detection coverage is improved, but evaluation time and cost increase
Solution Approach 1:
The solar module is divided into multiple evaluation regions, with at least one region configured to allow light transmission to the solar cell. By segmenting the evaluation process to focus only on specific regions rather than evaluating all solar cells uniformly, the method reduces overall evaluation time while maintaining defect detection coverage for critical areas.
2Measurement precision
If light-blocking members are used to isolate individual solar cells, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Light-blocking members are introduced as intermediary elements positioned between the light source and solar cells that require isolation. These members selectively block light paths to individual solar cells during evaluation, enabling precise measurement of each cell's photoluminescence without requiring complex isolation mechanisms for the entire module.
Solution Approach 2:
The evaluation system applies different light transmission properties to different regions of the solar module. By configuring at least one evaluation region to transmit light while blocking light to other regions, the system achieves local optimization where individual solar cells can be evaluated in isolation when needed, while maintaining efficiency in other areas.
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 the identification of defects in solar cells, distinguishing between internal semiconductor junction defects and electrical connection issues, improving the efficiency of solar module manufacturing by reducing the number of PL evaluations needed and allowing for the reuse of non-defective solar cells.
Implementation Method 1
a step for evaluating the solar cell to be evaluated among a plurality of solar cells by illuminating the solar cell with light from a light source and detecting the intensity of photoluminescent light emitted by the solar cell
Data Source
AI summary
Provided is a method for evaluating a solar cell incorporated into a solar module. A PL evaluation step is performed. The PL evaluation step is a step for evaluating the solar cell to be evaluated among a plurality of solar cells (10) by illuminating the solar cell (10) with light from a light source (20) and detecting the intensity of photoluminescent light (L2) emitted by the solar cell (10). The light is irradiated while a light-blocking member (21) is provided between the solar module (1) and the light source (20) so that light from the light source (20) is not incident on portions of the solar module other than the solar cell (10) to be evaluated.