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Light trapping in hematite-coated transparent particles for solar fuel generation

机译：捕获赤铁矿的透明颗粒中的光，用于产生太阳能

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摘要

Hematite (alpha-Fe2O3), due to its abundance and low-cost, is an attractive compound for photoelectrochemical splitting of water to produce hydrogen. However, one major obstacle preventing hematite from achieving the target efficiencies comprises its significantly smaller minority carrier transport distance relative to its optical absorption depth in the visible part of the optical spectrum. Here, we combine host-guest and Mie resonance concepts to achieve significant optical absorption in extremely thin layers of hematite. We propose and theoretically evaluate transparent particles coated with an extremely thin hematite shell as building blocks for hematite photoanodes. By full-field optical simulations we found out that maximal optical absorption is achieved when the particle supports two to three Mie resonance modes above the hematite optical absorption edge. Optical absorption efficiencies integrated over the air mass 1.5 global (AM1.5G) irradiance spectrum, AM1.5, reach more than 2 mA cm(-2) within a 10 nm thick hematite shell of a particle with optimal dimensions and AM1.5 comes close to 5 mA cm(-2) in a 25 nm thick hematite shell. Furthermore, we evaluate the performance when the particles are part of an array or stacked atop each other. The concept introduced here could be useful for improving optical absorption in semiconductors with extremely short carrier transport distances.
机译：赤铁矿（α-Fe2O3）由于其含量丰富且价格低廉，是用于光化学分解水以产生氢的有吸引力的化合物。然而，阻止赤铁矿达到目标效率的一个主要障碍包括其相对于在光谱的可见光部分的光吸收深度而言显着较小的少数载流子传输距离。在这里，我们结合了主客体和Mie共振概念，以在赤铁矿的极薄层中实现显着的光吸收。我们提出并从理论上评估涂有极薄赤铁矿壳的透明颗粒，作为赤铁矿光阳极的基础材料。通过全场光学模拟，我们发现，当颗粒在赤铁矿光吸收边缘上方支持两到三个Mie共振模式时，可获得最大的光吸收。空气质量1.5全局（AM1.5G）辐照光谱（eta（abs）> AM1.5）上集成的光吸收效率在10 nm厚的赤铁矿壳层中达到2 mA cm（-2）以上，具有最佳的颗粒尺寸和 AM1.5在25 nm厚的赤铁矿壳中接近5 mA cm（-2）。此外，我们评估了当粒子是阵列的一部分或彼此堆叠时的性能。此处介绍的概念可能对改善载流子传输距离极短的半导体的光吸收有用。

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