Nanopatterned indium tin oxide as a selective coating for solar thermal applications
Nanopatterned indium tin oxide as a selective coating for solar thermal applications
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DOI：
10.1016/j.renene.2023.04.020
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发表时间：
2023-04-21
期刊：
影响因子：
8.7
通讯作者：
Taylor, Robert A.
中科院分区：
文献类型：
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作者：
Motamedi, Mahdi;Jia, Guobin;Taylor, Robert A.
已提出氧化铟锡（ITO）涂层以减少太阳能热应用的热发射损失。不幸的是，ITO也有大量的自由电荷载流子（每立方厘米约1 × 1020），吸收阳光。为了解决这个问题，我们提出了一种纳米图案化的ITO涂层石英，其表现出抗反射性（以最大限度地提高太阳能透射率）和低发射率（以最大限度地减少长波长辐射损失）。通过双自组装制备了创纪录的小尺寸纳米球（~ 60 nm）蚀刻掩模，然后进行干法蚀刻和表征。同时，使用Lumerical FDTD软件对替代纳米图案几何形状进行建模，以优化短波长传输，而不降低未蚀刻ITO的固有低发射率。人们发现倒置的蛾眼图案（高度= 250 nm，间距= 80 nm）在各种太阳能集中度下给出了最佳结果（100 ℃时1个太阳，400 ℃时10个太阳，600 ℃时100个太阳），导致太阳能加权透射的~ 7%的改善以及选择性的总效率因子的类似提高。得出的结论是，如果所提出的沉积/蚀刻工艺可以在连续工艺中以具有成本效益的方式进行缩放，则它将为大多数太阳能热技术提供净性能提升。
Indium tin oxide (ITO) coatings have been proposed to reduce thermal emission losses for solar thermal applications. Unfortunately, ITO also has a large amount of free charge carriers (-1 x 1020 per cm3), which absorb sunlight. To address this issue, we propose a nano-patterned ITO-coated quartz exhibiting both anti-reflectivity (to maximize solar transmission) and low emissivity (to minimize long wavelengths radiative losses). A record small-size nanosphere (-60 nm) etch mask was prepared via double self-assembly, followed by dry etching and characterisation. In parallel, alternative nanopattern geometries were modelled using the Lumerical FDTD software to optimise short wavelength transmission without diminishing the inherently low emissivity of unetched ITO. It was found that an inverted moth's eye pattern (height = 250 nm and spacing = 80 nm) gave the best results at various solar concentrations (1 sun @ 100 degrees C, 10 suns @ 400 degrees C, and 100 suns @ 600 degrees C), resulting in -7% improvement in the solar weighted transmission as well as a similar boost in the overall efficiency factor for selectivity. It was concluded that if the proposed deposition/etching processes can be cost-effectively scaled in a continuous process, it would provide a net performance boost for most solar thermal technologies.