Mann Sander A, Grote Richard R, Osgood Richard M, Schuller Jon A
Columbia University, New York, NY 10027, USA.
Opt Express. 2011 Dec 5;19(25):25729-40. doi: 10.1364/OE.19.025729.
Using Mie theory and Rigorous Coupled Wave Analysis (RCWA) we compare the properties of dielectric particle and void resonators. We show that void resonators-low refractive index inclusions within a high index embedding medium-exhibit larger bandwidth resonances, reduced peak scattering intensity, different polarization anisotropies, and enhanced forward scattering when compared to their particle (high index inclusions in a low index medium) counterparts. We evaluate amorphous silicon solar cell textures comprising either arrays of voids or particles. Both designs support substantial absorption enhancements (up to 45%) relative to a flat cell with anti-reflection coating, over a large range of cell thicknesses. By leveraging void-based textures 90% of above-bandgap photons are absorbed in cells with maximal vertical dimension of 100 nm.
利用米氏理论和严格耦合波分析（RCWA），我们比较了介电粒子和空穴谐振器的特性。我们发现，空穴谐振器（高折射率嵌入介质中的低折射率内含物）与粒子（低折射率介质中的高折射率内含物）相比，展现出更大带宽的共振、降低的峰值散射强度、不同的偏振各向异性以及增强的前向散射。我们评估了由空穴或粒子阵列组成的非晶硅太阳能电池纹理。相对于具有抗反射涂层的平面电池，这两种设计在很大的电池厚度范围内都能实现显著的吸收增强（高达45%）。通过利用基于空穴的纹理，在最大垂直尺寸为100 nm的电池中，90%的带隙以上光子被吸收。
