Plasmonic absorption in textured silver back reflectors of thin film solar cells
Plasmonic absorption in textured silver back reflectors of thin film solar cells
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DOI：
10.1063/1.2981194
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发表时间：
2008-09-15
影响因子：
3.2
通讯作者：
Ballif, C.
中科院分区：
文献类型：
--
作者：
Haug, F-J.;Soederstroem, T.;Ballif, C.
我们研究了不同纹理和介电环境对银表面等离子体共振激发的影响，因为纹理金属膜通常用作硅薄膜太阳能电池的背接触。对于光和表面等离子体激发之间的耦合，我们使用周期性正弦结构，使我们能够通过简单的光谱反射测量在明确的条件下对色散关系进行采样。我们使用非晶硅/ZnO/银的三层样品来模拟薄膜硅太阳能电池中背接触的行为。细胞;测量结果表明，等离激元激发引起的损耗可以很好地延伸到需要最佳反射率的光谱区域。适当的ZnO厚度可以减少吸收损失。我们对周期性结构的发现也有助于解释随机纹理 ZnO/Ag 反射层上表面等离子体激元激发的行为。 (C) 2008 年美国物理研究所。 [DOI：10.1063/1.2981194]
We study the influence of different textures and dielectric environments on the excitation of surface plasmon resonances on silver because textured metallic films often serve as back contacts of silicon thin film solar cells. For coupling between light and the surface plasmon excitation we use a periodic sinusoidal structure that enables us to sample the dispersion relation at well defined conditions with a simple spectral reflection measurement. We use three layer samples of amorphous silicon/ZnO/silver to mimic the behavior of the back contact in a thin film silicon solar. cell; the measurements suggest that losses due to plasmon excitation can very well extend in the spectral region where optimum reflectance is desired. An appropriate thickness of ZnO is able to reduce absorption losses. Our findings on periodic structures are also found useful to explain the behavior of surface plasmon excitation on randomly textured ZnO/Ag reflector layers. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.2981194]