Dark Infrared-Transmitting Ink for Solar Module Heat Reduction
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Solution Overview
Problem
Existing infrared-light-transmitting dark color inks used in solar cell modules, such as those containing carbon black or oxazine pigments, either absorb near-infrared light, leading to increased module temperature and reduced efficiency, or fail to provide a black appearance desired for design attractiveness.
Innovation Solution
An infrared-light-transmitting dark color ink comprising a resin component and a pigment component with a brown pigment and a phthalocyanine pigment, which transmits near-infrared light and provides a dark color appearance, is developed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If carbon black is used to provide a dark color appearance, then design attractiveness is improved, but near-infrared light absorption increases causing temperature rise and reduced efficiency
Solution Approach 1:
The patent changes the chemical composition parameters of the pigment from carbon black to a specific combination of organic pigments (oxazine pigment with 20-80 wt% and violet pigment with 20-80 wt%). This parameter change allows the ink to maintain dark color appearance while transmitting near-infrared light, thereby resolving the contradiction between aesthetic requirements and energy loss.
2Loss of energy
If oxazine pigment is used to transmit infrared light, then near-infrared light transmission is improved, but the color appearance becomes violet rather than black
Solution Approach 1:
The patent creates a composite pigment system by combining oxazine pigment and violet pigment in specific proportions (20-80 wt% each). This composite approach allows the mixture to maintain the near-infrared transmission properties of oxazine while the combination produces a black color appearance, thus resolving the contradiction between infrared transmission and color aesthetics.
3Illumination intensity
If carbon black ink is used in rear surface protective sheet, then dark color appearance is achieved, but module temperature increases and electric power generation efficiency decreases
Solution Approach 1:
The patent changes the pigment composition parameter from carbon black to an organic pigment combination (oxazine and violet pigments). This parameter change enables the ink to provide dark color appearance while transmitting near-infrared light, preventing temperature increase and maintaining high electric power generation efficiency in solar cell modules.
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 ink suppresses heat generation by near-infrared light absorption and enhances electric power generation efficiency while maintaining design attractiveness, making it suitable for solar cell modules.
Implementation Method 1
the ink suppresses heat generation by near-infrared light absorption and enhances electric power generation efficiency
Implementation Method 2
An infrared-light-transmitting dark color ink comprising a resin component and a pigment component with a brown pigment and a phthalocyanine pigment, which transmits near-infrared light
Data Source
AI summary
In order to satisfy the demand of consumers regarding design attractiveness, an infrared-light-transmitting dark color ink is provided, the ink having a black appearance and attaining high design attractiveness and, despite this, having sufficient infrared-light-transmitting property. The infrared-light-transmitting dark color ink transmits near infrared light having wavelengths of 750-1,500 nm, and comprises a resin component and a pigment component that comprises both a brown pigment, e.g., a benzimidazolone pigment, and a phthalocyanine pigment.