Design of Broadband and Wide-angle HLHL Antireflective Coatings for Triple Junction Solar Cells

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  • Zhu Hanming
    School of Opto-electronic and Communication Engineering, Yunnan Open University

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<p>Reducing the surface optical loss and broadening the spectral response range is an effective method to improve the power conversion efficiency of the multi-junction solar cells. We simulated the different HLHL (high/low/high/low index) antireflection coatings (ARCs) for the triple-junction solar cells based on an optical transfer matrix. From the ARC optimization results, the total effective reflectivity (Re) of ZnS/MgF2/ZnS/MgF2 is the lowest among HLHL ARCs, which is 1.34%, best Re at the region of interest appeared to be 5.03% for the top solar cell, 1.20% for the middle solar cell, and 0.93% for the bottom solar cell. Moreover, the effects of thickness, refractive index, and incident angle on the performance of the ZnS/MgF2/ZnS/MgF2 ARC were analyzed. It was found that the thickness of each film decreases when it deviates from the optimal theoretical value, and the appropriate reduction of MgF2 refractive index can reduce total Re. The ZnS/MgF2/ZnS/MgF2 ARC exhibits remarkable antireflection properties over a broad wavelength and a wide angular range. The experimental results showed that the reflectance spectrum of ZnS/MgF2/ZnS/MgF2 is basically consistent with the theoretical curve.</p>

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