Su Junli, Chen Gang, Ma Chong, Zhang Qiuyu, Li Xingyu, Geng Yujia, Jia Bojie, Luo Haihan, Liu Dingquan
Shanghai Key Laboratory of Optical Coatings and Spectral Modulation, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China.
School of Physical Science and Technology, ShanghaiTech University, Shanghai 200031, China.
Nanomaterials (Basel). 2024 Mar 27;14(7):580. doi: 10.3390/nano14070580.
Efficient solar thermal conversion is crucial for renewable clean energy technologies such as solar thermal power generation, solar thermophotovoltaic and seawater desalination. To maximize solar energy conversion efficiency, a solar selective absorber with tailored absorption properties designed for solar applications is indispensable. In this study, we propose a broadband selective absorber based on amorphous carbon (a-C) metamaterials that achieves high absorption in the ultraviolet (UV), visible (Vis) and near-infrared (NIR) spectral ranges. Additionally, through metal doping, the optical properties of carbon matrix materials can be modulated. We introduce Ti@a-C thin film into the nanostructure to enhance light absorption across most of the solar spectrum, particularly in the NIR wavelength band, which is essential for improving energy utilization. The impressive solar absorptivity and photothermal conversion efficiency reach 97.8% and 95.6%, respectively. Notably, these superior performances are well-maintained even at large incident angles with different polarized states. These findings open new avenues for the application of a-C matrix materials, especially in fields related to solar energy harvesting.
高效的太阳能热转换对于太阳能热发电、太阳能热光伏和海水淡化等可再生清洁能源技术至关重要。为了最大化太阳能转换效率，一种为太阳能应用设计的具有定制吸收特性的太阳能选择性吸收器是必不可少的。在本研究中，我们提出了一种基于非晶碳（a-C）超材料的宽带选择性吸收器，该吸收器在紫外（UV）、可见（Vis）和近红外（NIR）光谱范围内实现了高吸收。此外，通过金属掺杂，可以调节碳基材料的光学性质。我们将Ti@a-C薄膜引入纳米结构中，以增强在大部分太阳光谱中的光吸收，特别是在近红外波段，这对于提高能量利用率至关重要。令人印象深刻的太阳能吸收率和光热转换效率分别达到97.8%和95.6%。值得注意的是，即使在不同偏振态的大入射角下，这些优异性能也能得到很好的保持。这些发现为a-C基材料的应用开辟了新途径，特别是在与太阳能收集相关的领域。
