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首页> 外文会议>Photovoltaic Specialists Conference (PVSC), 2011 37th IEEE >Silver nanoparticles for plasmonic light trapping in A-Si:H solar cells
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Silver nanoparticles for plasmonic light trapping in A-Si:H solar cells

机译：用于A-Si：H太阳能电池中等离子捕获的银纳米颗粒

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We investigate the use of silver nanoparticles as light scattering elements to improve light trapping in amorphous silicon solar cells. Simulations presented in literature show that these nanoparticles can scatter light very efficiently due to plasmon resonance. However, our previous experimental work showed that light trapping does not improve when silver nanoparticles, fabricated by annealing a thin silver film, are embedded in a-Si:H solar cells. To shed some light on this we investigate the optical properties of these nanoparticles in more detail. Silver nanoparticle films with a mass thickness ranging from 3 to 18 nm were fabricated, resulting in films with average particle sizes ranging from 20 to 120 nm. We found that in all cases less than 10% of the incident light is scattered. The undesired absorption of light by the silver nanoparticles is at least three times stronger than the desired light scattering effect. We tentatively attribute this to the wide size distribution and high surface coverage inherent to this particle fabrication technique. We use an effective medium approach to incorporate the experimentally obtained optical properties of the nanoparticle films into our opto-electrical device simulator. This allows us to use realistic optical properties in solar cell simulations. We focus on a solar cell design with the silver nanoparticles embedded in a transparent conductive oxide layer at the rear of the a-Si:H layer. The solar cell simulations show that light trapping does not improve as long as absorption dominates over scattering. The simulated quantum efficiency curves are in agreement with experimental results.
机译：我们研究了使用银纳米颗粒作为光散射元素来改善非晶硅太阳能电池中的光捕获。文献中的模拟表明，由于等离振子共振，这些纳米粒子可以非常有效地散射光。但是，我们先前的实验工作表明，将通过退火银薄膜制成的银纳米颗粒嵌入a-Si：H太阳能电池中，光捕获不会改善。为了对此有所了解，我们将更详细地研究这些纳米颗粒的光学性质。制备质量厚度为3至18nm的银纳米颗粒膜，从而得到平均粒径为20至120nm的膜。我们发现，在所有情况下，只有不到10％的入射光被散射。银纳米颗粒对光的不良吸收比所需的光散射效果至少强三倍。我们暂时将其归因于这种粒子制造技术固有的宽尺寸分布和高表面覆盖率。我们使用一种有效的介质方法将通过实验获得的纳米颗粒薄膜的光学特性整合到我们的光电设备模拟器中。这使我们能够在太阳能电池模拟中使用逼真的光学特性。我们专注于太阳能电池设计，其银纳米颗粒嵌入a-Si：H层背面的透明导电氧化物层中。太阳能电池的模拟表明，只要吸收在散射中占主导地位，光捕获不会改善。模拟的量子效率曲线与实验结果一致。

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