School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
Nanotechnology. 2012 May 17;23(19):194010. doi: 10.1088/0957-4484/23/19/194010. Epub 2012 Apr 27.
Investigation of solar energy harvesting in hexagonally arranged Si nanowire (NW) arrays is performed through optimizing the structural parameters, such as array periodicity (P), Si NW diameter (D) and length (L). The results demonstrate that there exist wide P and D/P 'windows' for the Si NW arrays, locating around 600 nm and 0.833 (i.e., D=500 nm), respectively, for achieving enhanced light absorption compared to their thin film counterparts with the same thickness, but with much less materials consumption. Calculation of the ultimate efficiency (UE) indicates that the light trapping capability is not monotonically increased with L, and that UE vibration is found when L is >1000 nm. Comparison of the light absorption spectra for hexagonally and squarely arranged Si NW arrays demonstrates that these two most widely employed array symmetries in practice have little impact on the light trapping capability.
通过优化结构参数，如阵列周期性（P）、硅纳米线（NW）直径（D）和长度（L），对六边形排列的 Si NW 阵列中的太阳能收集进行了研究。结果表明，与具有相同厚度的薄膜相比，Si NW 阵列存在较宽的 P 和 D/P'窗口，分别位于 600nm 和 0.833（即 D=500nm）附近，从而实现了增强的光吸收，但材料消耗却大大减少。最终效率（UE）的计算表明，光捕获能力并非随 L 的增加而单调增加，当 L>1000nm 时，UE 会发生波动。对六边形和正方形排列的 Si NW 阵列的光吸收光谱进行比较表明，这两种在实际中应用最广泛的阵列对称性对光捕获能力几乎没有影响。
