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首页> 外文会议>Physics, simulation, and photonic engineering of photovoltaic devices II >Broadband light absorption enhancement in thin-film solar cells by combining front dielectric and back metal gratings
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Broadband light absorption enhancement in thin-film solar cells by combining front dielectric and back metal gratings

机译：通过组合正面电介质和背面金属光栅来增强薄膜太阳能电池的宽带光吸收

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摘要

We numerically study the absorption enhancement of amorphous Si (a-Si) solar cells, in which a dual grating structure combining front dielectric grating and back metal grating is proposed to improve light absorption in the 300-900 nm wavelength range. The front dielectric grating scatters the incident light into active layer which can reduce reflection without much energy loss, especially at the short wavelengths. The back metal grating causes the absorption enhancement at long wavelengths due to the excitation of surface plasmon polaritons (SPPs) at the interface of metal/semiconductor and/or photonic modes in the active layer. When these two gratings are combined, a large, broadband absorption enhancement over the entire spectrum can be realized. For better comparison, the flat structure without any gratings is chosen as a reference. In our work, the absorption enhancement of the solar cells with dual gratings is superior to the structures with a front dielectric or back metal grating alone in almost over the entire wavelength range 300-900 nm. For wavelengths in the range 300-900 nm, 72.4% absorptivity is observed for 100-nm-thickness flat a-Si solar cell, 76.9% and 75.1% for front and back grating cases, and up to 82.6% for dual grating case at the grating period of 360 nm.
机译：我们对非晶硅（a-Si）太阳能电池的吸收增强进行了数值研究，其中提出了结合前介质光栅和后金属光栅的双光栅结构来改善300-900 nm波长范围内的光吸收。前面的介电光栅将入射光散射到有源层中，这可以减少反射而不会损失太多能量，尤其是在短波长下。由于在有源层中的金属/半导体和/或光子模式的界面处激发了表面等离激元极化子（SPP），因此背面金属光栅导致了长波长处的吸收增强。当将这两个光栅组合在一起时，可以在整个光谱范围内实现较大的宽带吸收增强。为了更好地进行比较，选择没有任何光栅的平面结构作为参考。在我们的工作中，几乎在整个300-900 nm的整个波长范围内，具有双光栅的太阳能电池的吸收增强性能都优于仅具有前介电或后金属光栅的结构。对于300-900 nm范围内的波长，厚度为100 nm的平面a-Si太阳能电池的吸收率达到72.4％，前后光栅盒的吸收率分别为76.9％和75.1％，双光栅盒的吸收率高达82.6％。 360 nm的光栅周期。

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