Simulation of Light Trapping Structures for Enhancing Radiation Hardness in Space Solar Cells

Authors

Nizami Z. Vagidov, Kyle H. Montgomery, Geoffrey K. Bradshaw, and David M. Wilt

Publication

44th IEEE Photovoltaic Specialists Conference, Washington, D.C., 2017.

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Abstract

In an effort to reduce the radiation degradation of triple-junction solar cells, imbedded photon management is investigated as a means for reducing the middle subcell thickness while maintaining subcell’s output. Three types of (In)GaAs subcells of the conventional InGaP/(In)GaAs/Ge triple-junction solar cells with different back-side gratings as light-reflecting devices were simulated. The best results were observed for the subcells with two-dimensional moth-eye back-side grating. More than 70 % of incident light is reflected into the non-zero diffraction orders which allows the thickness of the subcell to decrease from 3.5 to 1.25 µm.  This shrinkage of the subcell substantially increases the radiation hardness of the multi-junction solar cell.

Keywords

radiation hardness, triple-junction solar cell, moth-eye grating, blaze grating, lamellar grating, back reflector.

DOI

Citation

N. Z. Vagidov, K. H. Montgomery, G. K. Bradshaw, and D. M. Wilt, “Simulation of Light Trapping Structures for Enhancing Radiation Hardness in Space Solar Cells,” at the 44th IEEE Photovoltaic Specialists Conference, Washington, DC, 2017.