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We report design and fabrication of photonic crystal (PC) Si membrane reflectors with integrated inplane couplers (Si MR-Coupler) based on Fano resonance effect. The measured results show the Si MR-Coupler has a 99% reflection and > 0.22% in-plane coupling efficiency.
We present design criteria to demonstrate nanostructured high performance anti-reflection coatings that allows over 98.5% transmission over a broad visible spectral range with cone angles up to 120°. We propose a methodology to relate the nanostructures with different shapes and sizes as an equivalent of the graded index (GRIN) film. Starting from GRIN film we find the rate of change of refractive...
Inverted pyramid surface textures are demonstrated on flexible amorphous Si solar cells based on a resin imprint process. The surface texture reduces the reflectivity of the cells over a broad spectrum. The texture leads to relative cell efficiency increases from 7% at 0° (surface-normal incident) to as high as 22% at 60°. Larger efficiency improvement at higher incident angles is a result of the...
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