Michallon Jérôme, Bucci Davide, Morand Alain, Zanuccoli Mauro, Consonni Vincent, Kaminski-Cachopo Anne
Opt Express. 2014 Jun 30;22 Suppl 4:A1174-89. doi: 10.1364/OE.22.0A1174.
The absorption properties of ZnO nanowire arrays covered with a semiconducting absorbing shell for extremely thin absorber solar cells are theoretically investigated by optical computations of the ideal short-circuit current density with three-dimensional rigorous coupled wave analysis. The effects of nanowire geometrical dimensions on the light trapping and absorption properties are reported through a comprehensive optical mode analysis. It is shown that the high absorptance of these heterostructures is driven by two different regimes originating from the combination of individual nanowire effects and nanowire arrangement effects. In the short wavelength regime, the absorptance is likely dominated by optical modes efficiently coupled with the incident light and interacting with the nearby nanowires (i.e. diffraction), induced by the period of core shell ZnO nanowire arrays. In contrast, in the long wavelength regime, the absorptance is governed by key optically guided modes, related to the diameter of individual core shell ZnO nanowires.
通过三维严格耦合波分析对理想短路电流密度进行光学计算，从理论上研究了覆盖有半导体吸收壳的ZnO纳米线阵列对超薄吸收体太阳能电池的吸收特性。通过全面的光学模式分析，报道了纳米线几何尺寸对光捕获和吸收特性的影响。结果表明，这些异质结构的高吸收率由两种不同的机制驱动，这两种机制源于单个纳米线效应和纳米线排列效应的结合。在短波长区域，吸收率可能由与入射光有效耦合并与附近纳米线相互作用的光学模式（即衍射）主导，这是由核壳ZnO纳米线阵列的周期引起的。相比之下，在长波长区域，吸收率由与单个核壳ZnO纳米线直径相关的关键光导模式控制。
