从螺旋度保持的观点看太阳能电池中宽带后向散射抑制
Insights into broadband backscattering suppression in solar cells from the helicity preservation point of view
摘要：
在扩展的光谱范围内抑制来自材料界面或整个层堆叠的反射对于各种应用是重要的。虽然已经描述了许多方法用于此目的，我们看看这里的问题从螺旋度保存的角度。具体而言，太阳能电池堆顶部的纳米颗粒阵列的抗反射性能与两个条件有关：足够高的离散旋转对称度和系统在光-物质相互作用时抑制电磁场的两个旋度（螺旋度）之间的串扰的能力。对于具有足够高的离散旋转对称度（$n>2$的$2π/n$）的粒子晶格系统，我们的数值研究链接的抑制后向散射的系统，以避免入射场的两个螺旋度分量之间的混合的能力。在示例性设计中，我们使用放置在平坦异质结太阳能电池堆顶部的TiO $_2$盘阵列，并分析系统的螺旋度保持特性。我们数值计算表明，六边形阵列晶格，具有较高程度的离散旋转对称性，可以提高抗反射性能的正方形晶格。重要的是，盘以电解耦的方式引入，使得器件的钝化和电特性不受干扰。
英文摘要：
Suppressing the reflection from material interfaces or entire layer stacks across an extended spectral range is important for various applications. While many approaches have been described for this purpose, we look at the problem here from the perspective of helicity preservation. Specifically, the anti-reflection performance of nano-particle arrays on top of solar cell stacks is related to two conditions: a high enough degree of discrete rotational symmetry and the ability of the system to suppress cross-talk between the two handednesses (helicities) of the electromagnetic field upon light-matter interaction. For particle-lattice systems with high enough degree of discrete rotational symmetry ($2π/n$ for $n>2$), our numerical studies link the suppression of backscattering to the ability of the system to avoid the mixing between the two helicity components of the incident field. In an exemplary design, we use an array of TiO$_2$ disks placed on top of a flat heterojunction solar cell stack, and analyze the helicity preservation properties of the system. We show numerically that a hexagonal array lattice, featuring a higher degree of discrete rotational symmetry, can improve over the anti-reflection performance of a square lattice. Importantly, the disks are introduced in an electrically decoupled manner such that the passivation and electric properties of the device are not disturbed.
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