Single-nanowire solar cells with a unique light-concentration property are expected to exceed the Shockley–Queisser limit. The architecture of single nanowire is an important factor to regulate its optical performance. We designed a trilobal silicon nanowire (SiNW) with two equivalent scales that possesses superior light-absorption efficiency in the whole wavelength range and shows good tolerance for incident angle. The electric field distribution in this geometry is concentrated in the blade with small equivalent scale and pivot with large equivalent scale, respectively, in the short wavelength range and long wavelength range. Corresponding good light absorption of trilobal SiNW in the two wavelength ranges leads to stronger total light-absorption capacity than that of cylindrical SiNW. Trilobal single-nanowire solar cells can obtain a short-circuit current density (JSC) of 647 mA·cm−2, which provides a new choice for designing single nanowire with excellent light-capture capability.

中文翻译：

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三叶形SiNW优异的光捕获能力，用于单纳米线太阳能电池中的超高JSC

具有独特聚光特性的单纳米线太阳能电池有望超过肖克利-奎瑟极限。单纳米线的结构是调节其光学性能的重要因素。我们设计了一种具有两个等效尺度的三叶硅纳米线 (SiNW)，它在整个波长范围内具有卓越的光吸收效率，并且对入射角具有良好的耐受性。该几何结构中的电场分布分别集中在短波长范围和长波长范围内等效尺度较小的叶片和等效尺度较大的枢轴上。三叶形SiNW在两个波长范围内相应的良好光吸收导致比圆柱形SiNW更强的总光吸收能力。