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首页> 外文会议>Photonics for solar energy systems III >Enhanced light trapping in thin amorphous silicon solar cells by directionally selective optical filters
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Enhanced light trapping in thin amorphous silicon solar cells by directionally selective optical filters

机译：通过定向选择性滤光片增强非晶硅薄太阳能电池中的光捕获

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摘要

Optical absorption losses limit the efficiency of thin-film solar cells. We demonstrate how to increase the absorption in hydrogenated amorphous silicon solar cells by using a directionally selective optical multilayer filter covering the front glass. The filter transmits perpendicularly incident photons in the wavelength range 350 nm - 770 nm. In the regime of low absorptance, i.e. large optical absorption lengths, however, it blocks those photons impinging under oblique angles. Thus, the incoming radiation is transmitted with almost no loss while the emitted radiation is mostly blocked due to its wider angle distribution. We determine the enhancement in the optical path length from reflectivity measurements. In the weakly absorbing high wavelength range (650 nm - 770 nm) we observe a peak optical path length enhancement of k ～ 3.5. The effective path length enhancement k calculated from the external quantum efficiency of the solar cell with filter, however, peaks at a lower value of only k ～ 1.5 in the same wavelength range. Parasitic absorption in the layers adjacent to the photovoltaic absorber limit the increase in the effective light path enhancement. Nonetheless we determine an increase of 0.2 mAcm~2 in the total short circuit current density.
机译：光吸收损失限制了薄膜太阳能电池的效率。我们演示了如何通过使用覆盖前玻璃的定向选择性光学多层滤光片来增加氢化非晶硅太阳能电池中的吸收。滤光片透射波长范围为350 nm-770 nm的垂直入射光子。然而，在低吸收率的情况下，即大的光吸收长度，它阻挡了那些以倾斜角度入射的光子。因此，入射的辐射几乎没有损失地被传输，而发射的辐射由于其更宽的角度分布而被大部分阻挡。我们通过反射率测量确定光程长度的增强。在弱吸收的高波长范围（650 nm-770 nm）中，我们观察到最大光程长度增强k〜3.5。由带滤波器的太阳能电池的外部量子效率计算出的有效路径长度增强k在相同波长范围内仅在k〜1.5的较低值处达到峰值。与光伏吸收器相邻的层中的寄生吸收限制了有效光路增强的增加。尽管如此，我们确定总短路电流密度增加了0.2 mAcm〜2。

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