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SiO2 nanosphere textured back reflectors for enhanced light trapping in amorphous and nanocrystalline silicon solar cells

机译:SiO2纳米球纹理背反射器,用于增强非晶硅和纳米晶硅太阳能电池中的光捕获

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摘要

Silica microspheres were investigated as a back surface texturing agent for hydrogenated amorphous (a-Si:H) and nanocrystalline (nc-Si:H) silicon solar cells. Absorption of long wavelength photons (\u3e600nm) is minimal for a-Si:H and nc-Si:H thin films which limits the efficiency of thin-film solar cells. Textured back reflectors are often used to increase the efficiency of these solar cells by diffusely reflecting light and trapping it in the absorbing layer.In this research, stainless steel substrates were spin coated with silica spheres to add texture. After a post-anneal, silver was deposited on the substrates. Two sphere diameters (250nm and 500nm) were investigated for their impact on diffuse reflection versus wavelength. It was found that the peak in diffuse reflection could be controlled by varying the sphere diameter. The thickness of the silver layer was determined by maximizing the total reflection, and diminishing returns were found for a silver layer greater than 300nm.External quantum efficiency measurements were used to characterize carrier collection versus wavelength. An increase in carrier collection at long wavelengths (\u3e600nm) was observed for both a-Si:H and nc-Si:H solar cells on the silica sphere textured substrates. The thin a-Si:H solar cells often shorted out during testing which limits the industrial application of this back reflector. Shorting was not found to be a problem with the nc-Si:H devices.
机译:研究了二氧化硅微球作为氢化非晶硅(a-Si:H)和纳米晶体(nc-Si:H)硅太阳能电池的背面纹理化剂。对于a-Si:H和nc-Si:H薄膜,长波长光子(\ u3e600nm)的吸收极小,这限制了薄膜太阳能电池的效率。带纹理的后反射器通常用于通过漫反射光并将其捕获在吸收层中来提高这些太阳能电池的效率。在这项研究中,对不锈钢基板旋涂二氧化硅球以增加质感。后退火之后,将银沉积在基底上。研究了两个球体直径(250nm和500nm)对漫反射与波长的关系。发现通过改变球体直径可以控制漫反射的峰值。通过最大化全反射来确定银层的厚度,并且发现大于300nm的银层的反射率递减。使用外部量子效率测量来表征载流子收集与波长的关系。对于二氧化硅球结构化基板上的a-Si:H和nc-Si:H太阳能电池,在长波长(\ u3e600nm)处观察到载流子收集的增加。薄的a-Si:H太阳能电池经常在测试过程中短路,这限制了该背反射器的工业应用。 nc-Si:H器件未发现短路问题。

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    Boesch, Ryan;

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  • 年度 2009
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  • 正文语种 en
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