Passive radiative cooling is a method to dissipate excess heat from a material by the spontaneous emission of infrared thermal radiation. For a solar cell, the challenge is to enhance PRC while retaining transparency for sunlight above the bandgap. Here, we design a hexagonal array of cylinders etched into the top surface of silica solar module glass to enhance passive radiative cooling. Multipolar Mie-like resonances in the cylinders are shown to cause antireflection effects in the infrared, which results in enhanced infrared emissivity. Using Fourier transform infrared spectrometry we measure the hemispherical reflectance of the fabricated structures and find the emissivity of the silica cylinder array in good correspondence with the simulated results. The microcylinder array increases the average emissivity between λ = 7.5–16 μm from 84.3% to 97.7%, without reducing visible light transmission.

中文翻译：

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具有光子二氧化硅微圆柱的硅太阳能模块的被动辐射冷却

被动辐射冷却是一种通过红外热辐射的自发辐射从材料中散发多余热量的方法。对于太阳能电池，挑战在于增强 PRC，同时保持带隙以上阳光的透明度。在这里，我们设计了一个六边形的圆柱体阵列，蚀刻在二氧化硅太阳能模块玻璃的顶面，以增强被动辐射冷却。圆柱体中的多极类 Mie 共振被证明会导致红外线的抗反射效应，从而提高红外线发射率。我们使用傅立叶变换红外光谱法测量制造结构的半球反射率，并发现二氧化硅圆柱阵列的发射率与模拟结果非常吻合。微圆柱阵列将 λ = 7.5–16 μm 的平均发射率从 84 提高到 7.5–16 μm。