Directing the propagation of near-infrared radiation is a major concern in improving the efficiency of solar cells and thermal insulators. A facile approach to scatter light in the near-infrared region without excessive heating is to embed compact layers with semiconductor particles. The directional scattering by [email protected] ([email protected]) spherical particles (containing Si, InP, TiO₂, SiO₂, or ZrO₂) with a total radius varying from 0.1 μm to 4.0 µm and in an insulating medium at a low volume fraction is investigated using Lorenz–Mie theory and multiscale modeling. The optical response of each layer is calculated under irradiation by the Sun or a blackbody emitter at 1180 K. Reflectance efficiency factors of up to 83.7% and 63.9% are achieved for near-infrared solar and blackbody radiation in 200 µm thick compact layers with only 1% volume fraction of bare Si particles with a radius of 0.23 µm and 0.50 µm, respectively. The maximum solar and blackbody efficiency factors of layers containing InP particles were slightly less (80.2% and 60.7% for bare particles with a radius of 0.25 µm and 0.60 µm, respectively). The addition of an oxide coating modifies the surrounding dielectric environment, which improves the solar reflectance efficiency factor to over 90%, provided it matches the scattering mode energies with the incident spectral density. The layers are spectrally sensitive and can be applied as a back or front reflector for solar devices, high temperature thermal insulators, and optical filters in gradient heat flux sensors for fire safety applications.

中文翻译：

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用粒子引导近红外光子传输

指导近红外辐射的传播是提高太阳能电池和隔热材料效率的主要考虑因素。在不过度加热的情况下将光散射到近红外区域的一种简便方法是在紧凑层中嵌入半导体颗粒。由定向散射[电子邮件保护]（[电子邮件保护]）的球形颗粒（含有Si，磷化铟，二氧化钛₂的SiO ₂，和ZrO ₂）以0.1总半径变μ m至4.0 μ使用Lorenz-Mie理论和多尺度建模研究了m和在低体积分数的绝缘介质中的情况。每个层的光学响应由太阳或在高达至83.7％和63.9％1180个K.反射效率因子的黑体发射器照射下计算近红外太阳能和黑体辐射在200达到μ米，厚紧凑层只裸Si粒子的1％体积分数0.23的半径μ m和0.50 μ分别米。含的InP颗粒层的最大太阳能和黑体效率因素是略少（80.2％和裸颗粒具有0.25的半径60.7％μ m和0.60 μm）。氧化物涂层的添加改变了周围的介电环境，只要它使散射模式能量与入射光谱密度匹配，就可以将太阳反射效率因子提高到90％以上。这些层对光谱敏感，可以用作太阳能设备，高温热绝缘体以及用于火灾安全应用的梯度热通量传感器中的滤光器的后反射器或前反射器。