Hussein Mohamed, Hameed Mohamed Farhat O, Areed Nihal F F, Yahia Ashraf, Obayya S S A
Opt Lett. 2016 Mar 1;41(5):1010-3. doi: 10.1364/OL.41.001010.
In this Letter, funnel-shaped silicon nanowires (SiNWs) are newly introduced for highly efficient light trapping. The proposed designs of nanowires are inspired by the funnel shape, which enhances the light trapping with reduced reflections in the wavelength range from 300 to 1100 nm. Composed of both cylindrical and conical units, the funnel nanowires increase the number of leaky mode resonances, yielding an absorption enhancement relative to a uniform nanowire array. The optical properties of the suggested nanowires have been numerically investigated using the 3D finite difference time domain (FDTD) method and compared to cylindrical and conical counterparts. The structural geometrical parameters are studied to maximize the ultimate efficiency and hence the short-circuit current. Carefully engineered structure geometry is shown to yield improved light absorption useful for solar cell applications. The proposed funnel-shaped SiNWs offer an ultimate efficiency of 41.8%, with an enhancement of 54.8% relative to conventional cylindrical SiNWs. Additionally, short-circuit current of 34.2 mA/cm2 is achieved using the suggested design.
在本信函中，新引入了漏斗形硅纳米线（SiNWs）用于高效光捕获。所提出的纳米线设计灵感来源于漏斗形状，其在300至1100纳米波长范围内增强了光捕获并减少了反射。由圆柱形和圆锥形单元组成的漏斗形纳米线增加了泄漏模式共振的数量，相对于均匀纳米线阵列产生了吸收增强。使用三维有限差分时域（FDTD）方法对所建议纳米线的光学特性进行了数值研究，并与圆柱形和圆锥形对应物进行了比较。研究了结构几何参数以最大化最终效率，从而最大化短路电流。精心设计的结构几何形状显示出可产生对太阳能电池应用有用的改进光吸收。所提出的漏斗形SiNWs的最终效率为41.8%，相对于传统圆柱形SiNWs提高了54.8%。此外，使用所建议的设计实现了34.2 mA/cm²的短路电流。
