Effect of Anti-Soiling Layer Coated on Poly(methyl methacrylate) for Concentrator Photovoltaic Modules

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An anti-soiling layer was coated on a poly(methyl methacrylate) (PMMA) substrate. The anti-soiling layer was prepared by coating the acrylic urethane capping layer, the inorganic/organic nano-graded intermediate layer, and the photocatalytic surface layer including modified WO3 and partial hydrolyzed tetraethyl orthosilicate. The layers were coated by spin-coat method. The photocurrent from each subcell of the InGaP/InGaAs/Ge triple-junction solar cell can be calculated by multiplying the solar spectrum of AM1.5D (850 W/m2), the transmittance of the PMMA substrate, and the spectral response of the triple-junction solar cell. After 8 months exposure, the reduction rate of photocurrent of the sample without anti-soiling coat was 9.6%. On the other hand, that with anti-soiling coat could be suppressed to 3.3%.
2012-10-25