Dark IR-Transmitting Ink Composition for Cooler Solar Modules
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Solution Overview
Problem
Existing infrared-light-transmitting dark color inks used in solar cell modules absorb near infrared light, leading to increased temperatures and reduced electric power generation efficiency.
Innovation Solution
Development of an infrared-light-transmitting dark color ink containing a pigment component with a brown pigment and a phthalocyanine pigment, which transmits near infrared light and provides a dark color appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If carbon black is used to provide dark color appearance, then design attractiveness is improved, but near infrared light absorption increases causing temperature rise and reduced power generation efficiency
Solution Approach 1:
The patent changes the chemical composition parameters of the pigment from carbon black to a combination of violet pigment (C.I. Pigment Violet 23) and yellow pigment (C.I. Pigment Yellow 120), which fundamentally alters the optical properties to achieve dark appearance without near-infrared absorption
Solution Approach 2:
The patent uses a composite pigment system combining violet and yellow pigments in specific proportions (0.1-10 wt% violet pigment and 0.1-10 wt% yellow pigment relative to total pigment content) to achieve the desired optical properties that neither pigment could achieve alone
2Loss of energy
If oxazine pigment is used to transmit infrared light, then power generation efficiency is improved, but the color appears violet rather than black reducing design attractiveness
Solution Approach 1:
The patent changes the pigment composition from oxazine to a specific combination of violet and yellow pigments, altering the spectral transmission characteristics to maintain infrared transparency while achieving black appearance through color mixing
Solution Approach 2:
The patent utilizes color mixing theory by combining violet and yellow pigments in specific ratios to produce a black appearance that transmits infrared light, overcoming the limitation of oxazine pigment which appears violet rather than black
3Ease of manufacture
If existing dark color inks are used in rear surface protective sheet, then manufacturing simplicity is maintained, but temperature increase reduces electric power generation efficiency
Solution Approach 1:
The patent modifies the ink composition parameters by replacing carbon black with violet and yellow pigments, maintaining the single-layer application process while achieving the dual benefit of dark appearance and infrared transmission for improved power generation efficiency
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 effectively suppresses heat generation by transmitting near infrared light, enhancing the electric power generation efficiency of solar cell modules while maintaining design attractiveness.
Implementation Method 1
carbon black absorbs near infrared light... the oxazine pigment transmits light having a wavelength of 700 to 800 nm... the infrared-light-transmitting dark color ink transmits near infrared light having a wavelength of 750 nm to 1500 nm
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.