Thin-Film Solar Module Stabilization via High-Intensity Light Soaking
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Solution Overview
Problem
Thin-film solar modules experience a temporary reduction in nominal power due to defects caused by the lamination process, particularly those based on chalcopyrite semiconductors, which can lead to suboptimal performance and financial losses.
Innovation Solution
A method involving high-intensity artificial lighting with an irradiance of at least 5 kW/m² for a short duration to rapidly heal defects in the semiconductor layer, stabilizing the nominal power of thin-film solar modules by illuminating the laminated composite or specific sections of it, allowing for quicker recovery within single-digit minute cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lamination process is performed to create weather-stable photovoltaic modules, then mechanical strength and weather stability are improved, but temporary reduction in nominal power occurs due to defects in the semiconductor layer
Solution Approach 1:
The patent applies preliminary action by performing light soaking treatment before the lamination process. This pre-treatment stabilizes the semiconductor layer against subsequent lamination-induced defects, preventing power reduction rather than correcting it afterward. The light soaking is performed on the solar cells before they are encapsulated in the lamination process, allowing the semiconductor material to adapt to light exposure conditions prior to being sealed, thereby maintaining both weather stability and nominal power.
2Power
If natural photoaging is used to heal lamination defects, then nominal power is restored, but production cycle time is significantly extended
Solution Approach 1:
The patent performs light soaking treatment before lamination to prevent power reduction, eliminating the need for post-lamination photoaging. This preliminary stabilization approach removes the time-consuming recovery period entirely from the production cycle, as modules are stabilized proactively rather than requiring extended natural photoaging afterward.
Solution Approach 2:
The patent skips the lengthy natural photoaging process by implementing accelerated light soaking treatment before lamination. This rushes through the stabilization requirement in a controlled pre-lamination step, preventing the need to wait for slow natural recovery and thereby compressing the overall production timeline.
3Power
If light soaking treatment is applied after lamination to restore nominal power, then power stabilization is achieved, but additional production time and complexity are required
Solution Approach 1:
The patent integrates light soaking treatment into the pre-lamination process flow, performing stabilization before encapsulation rather than adding a separate post-lamination step. This preliminary action consolidates multiple functions into the existing production sequence, avoiding additional equipment or process complexity while achieving power stabilization.
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 significantly increases the transiently reduced nominal power of thin-film solar modules, achieving results comparable to photoaging under standard test conditions in a fraction of the time, while reducing production cycle times and enhancing module value.
Implementation Method 1
Photovoltaic layer systems for directly converting sunlight into electrical energy
Implementation Method 2
the effect of heat, pressure and moisture during lamination creates defects in the semiconductor layer, which heal over time
Data Source
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AI summary
The invention relates to a method for improving the nominal output of a thin-film solar module with a laminated composite of two substrates which are connected to each other by at least one adhesive layer and between which there are solar cells connected in series, in which method the solar cells are illuminated with artificial light with an irradiance of at least 5 kW/m2.