研究目的
Investigating the influence of colour on the energy efficiency of solar cell modules, specifically how different colours affect the reflectance spectra and relative efficiency loss.
研究成果
The lightness of the colour is the most important parameter affecting the loss in opaque solar cell modules based on crystalline silicon. Green colours are more energy efficient than grey, while blue and red colours are less energy efficient when comparing colours with the same lightness. A Colour Performance Index (CPI) was established as a figure of merit, showing that measured modules range from 0.9 up to 1.6, compared to a maximum CPI of 5.75 for a minimum loss green module.
研究不足
The study assumes no parasitic losses in the cover glass, encapsulation, or reflecting elements, representing a lower limit of efficiency loss for a given reflectance. The model is valid for opaque crystalline silicon solar cells and may not apply to other PV technologies without adjustments.
1：Experimental Design and Method Selection:
The study involved measuring reflectance spectra of 15 coloured solar cell modules and comparing them to model spectra with colour coordinates corresponding to RAL colours and idealized monochromatic spectra.
2：Sample Selection and Data Sources:
Samples were received from different suppliers, all based on crystalline silicon with different technologies for colour generation.
3：List of Experimental Equipment and Materials:
A PerkinElmer 1050 spectrophotometer was used for spectral reflectance measurements.
4：Experimental Procedures and Operational Workflow:
Reflectance spectra were measured with an 8° incident angle and a 150 mm integrating sphere accessory, recording total reflectance from 280 to 2500 nm.
5：Data Analysis Methods:
Colour coordinates and relative losses were calculated using CIE XYZ, L*a*b* and L*C*h° colour spaces, with D65 as illuminant and CIE 1931 2° observer for colour matching functions.
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