Liu Zhengqi, Zhong Haozong, Liu Guiqiang, Liu Xiaoshan, Wang Yan, Wang Junqiao
Opt Express. 2020 Oct 12;28(21):31763-31774. doi: 10.1364/OE.405012.
In this work, a feasible way for perfect absorption in the whole solar radiance range is numerically demonstrated via the multiple resonances in a 600-nm-thick refractory prismoid. Under the standard AM 1.5 illumination, the measured solar energy absorption efficiency reaches 99.66% in the wavelength range from 280 nm to 4000 nm, which indicates only a rather small part of solar light (0.34%) escaped. The record harvesting efficiency directly results from the near-unity absorption for the multi-layer refractory resonators, which can simultaneously benefit from the multi-resonant behaviors of the structure and the broadband resonant modes by the material intrinsic features. The absorption including the intensity and frequency range can be adjusted via the structural features. These findings can hold wide applications in solar energy related optoelectronics such as the thermal-photovoltaics, photo-thermal technology, semiconductor assisted photo-detection, ideal thermal emitters, etc.
在这项工作中，通过一个600纳米厚的耐火棱台中的多重共振，从数值上证明了在整个太阳辐射范围内实现完美吸收的一种可行方法。在标准AM 1.5光照下，在280纳米至4000纳米的波长范围内，测得的太阳能吸收效率达到99.66%，这表明只有相当小一部分太阳光（0.34%）逃逸。创纪录的收集效率直接源于多层耐火谐振器的近乎完全吸收，这可以同时受益于结构的多共振行为和材料固有特性产生的宽带共振模式。包括强度和频率范围在内的吸收可以通过结构特征进行调节。这些发现可广泛应用于太阳能相关的光电子学领域，如热光伏、光热技术、半导体辅助光探测、理想热发射体等。
