| Summary: | 碩士 === 國立交通大學 === 平面顯示技術碩士學位學程 === 102 === In view of the advantages of low temperature process and high efficiency possibility, the amorphous silicon (a-Si) / crystalline silicon (c-Si) hetero-junction (HJ) solar cells have been studied. Using nano-patterned structure, reducing light reflection to enhance light absorption and increase the short-circuit current density for HIT solar cell. In this paper, design simulation model of nano conical frustum arrays for HIT solar cell surface. The optical properties of the nano conical frustum arrays are theoretically studied via simulation based on the rigorous coupled wave analysis (RCWA) in detail. Hexagonal nano conical frustum arrays is more coverage density than square nano conical frustum arrays due to achieve maximum utilization of space. The results show that the hexagonal nano conical frustum arrays has efficient light harvesting when the ratio of diameter to periodicity (D/P) is around 0.5. The optimal hexagonal nano conical frustum arrays has 400nm of the periodicity(P), 175nm of the diameter(D), 125nm of the height(H) and 750 of the slant angle (θ), yielding an ultimate short-circuit current density of 36.85 mA/cm2, which improve 14.6% than planar HIT solar cells.
The angle of incidence of the sun changes during a day and sunlight reaching the earth is a mixture of direct and scattered radiation after passing through the atmosphere. The array of nanostructure can significantly suppress the reflectance to increases short-circuit current density. Excellent broadband and omnidirectional anti-reflection coatings to allow to be reduce the thickness of the substrate and potential to further improve cost-performance.
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