Extraordinary Light-Trapping Enhancement in Silicon Solar Cell Patterned with Graded Photonic Super-Crystals
Extraordinary Light-Trapping Enhancement in Silicon Solar Cell Patterned with Graded Photonic Super-Crystals
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DOI：
10.3390/photonics4040050
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发表时间：
2017-12
期刊：
影响因子：
2.4
通讯作者：
Safaa Hassan;David Lowell;M. Adewole;D. George;Hualiang Zhang;Yuankun Lin
中科院分区：
文献类型：
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作者：
Safaa Hassan;David Lowell;M. Adewole;D. George;Hualiang Zhang;Yuankun Lin
本文首次探讨了新发现的具有双周期性和双基的梯度光子超晶体（GPSCs）的光捕获增强。宽带、宽入射角和偏振无关的光捕获增强在硅太阳能电池中实现。这些超晶体采用多光束干涉设计，使其具有灵活性和高效性。图案化硅太阳能电池的光学响应保持布洛赫模式共振；然而，由于梯度的、复杂的单位超细胞纳米结构，光吸收在宽带波长上大大增强，导致布洛赫模式共振的重叠。宽频宽角光耦合和捕获增强机制是由折射率的空间变化引起的，而这种空间变化是由不同方向上填充分数、对偶基和晶格常数的变化引起的。
Light-trapping enhancement in newly discovered graded photonic super-crystals (GPSCs) with dual periodicity and dual basis is herein explored for the first time. Broadband, wide-incident-angle, and polarization-independent light-trapping enhancement was achieved in silicon solar cells patterned with these GPSCs. These super-crystals were designed by multi-beam interference, rendering them flexible and efficient. The optical response of the patterned silicon solar cell retained Bloch-mode resonance; however, light absorption was greatly enhanced in broadband wavelengths due to the graded, complex unit super-cell nanostructures, leading to the overlap of Bloch-mode resonances. The broadband, wide-angle light coupling and trapping enhancement mechanism are understood to be due to the spatial variance of the index of refraction, and this spatial variance is due to the varying filling fraction, the dual basis, and the varying lattice constants in different directions.