Nano-scaled metallic or dielectric structures may provide various ways totrap light into thin-film solar cells for improving the conversion efficiency.In most schemes, the textured active layers are involved into light trappingstructures that can provide perfect optical benefits but also bring undesirabledegradation of electrical performance. Here we propose a novel approach todesign high-performance thin-film solar cells. In our strategy, a flat activelayer is adopted for avoiding electrical degradation, and an optimizationalgorithm is applied to seek for an optimized light trapping structure for thebest optical benefit. As an example, we show that the efficiency of a flata-Si:H thin-film solar cell can be promoted close to the certified highestvalue. It is also pointed out that, by choosing appropriate dielectricmaterials with high refractive index (>3) and high transmissivity in wavelengthregion of 350nm-800nm, the conversion efficiency of solar cells can be furtherenhanced.
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