Nanodome Solar Cells with Efficient Light Management and Self-Cleaning
Nanodome Solar Cells with Efficient Light Management and Self-Cleaning
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DOI：
10.1021/nl9034237
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发表时间：
2010-06-01
期刊：
影响因子：
10.8
通讯作者：
Cui, Yi
中科院分区：
文献类型：
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作者：
Zhu, Jia;Hsu, Ching-Mei;Cui, Yi
在这里，我们第一次展示了新型的纳米穹顶太阳能电池，这种电池从底部衬底到顶部的透明接触，对所有的层都具有周期性的纳米级调制。这些器件结合了许多纳米光子效应，既有效地减少了反射，又在广泛的光谱范围内增强了吸收。只有280 nm厚的氢化非晶硅(a-Si：H)层的Nanodome太阳电池可以吸收波长为400-800 nm的94%的光，显著高于平膜器件的65%的吸收。由于几乎完全吸收，我们的纳米球器件获得了17.5 mA/cm(2)的很大的短路电流。令人兴奋的是，光管理效果在大范围的入射角度下仍保持高效，有利于具有显著漫反射阳光的真实环境。我们展示了功率效率为5.9%的纳米球体器件，这比平板薄膜控制的器件高出25%。纳米穹顶结构原则上不限于任何特定的材料体系，其制造与大多数太阳能制造兼容；因此，它为各种光伏设备提供了令人兴奋的机会，以进一步提高性能，减少材料使用量，并缓解元素丰度限制。最后，我们的纳米球装置在用疏水分子修饰后，呈现出近乎超疏水的表面，从而实现了太阳能电池的自清洁。
Here for the first time, we demonstrate novel nanodome solar cells, which have periodic nanoscale modulation For all layers from the bottom substrate, through the active absorber to the top transparent contact. These devices combine many nanophotonic effects to both efficiently reduce reflection and enhance absorption over a broad spectral range. Nanodome solar cells with only a 280 nm thick hydrogenated amorphous silicon (a-Si:H) layer can absorb 94% of the light with wavelengths of 400-800 nm, significantly higher than the 65% absorption of flat film devices. Because of the nearly complete absorption, a very large short-circuit current of 17.5 mA/cm(2) is achieved in our nanodome devices. Excitingly, the light management effects remain efficient over a wide range of incident angles, favorable for real environments with significant diffuse sunlight. We demonstrate nanodome devices with a power efficiency of 5.9%, which is 25% higher than the flat film control. The nanodome structure is not in principle limited to any specific material system and its fabrication is compatible with most solar manufacturing; hence it opens up exciting opportunities for a variety of photovoltaic devices to further improve performance, reduce materials usage, and relieve elemental abundance limitations. Lastly, our nanodome devices when modified with hydrophobic molecules present a nearly superhydrophobic surface and thus enable self-cleaning solar cells.