Zahir Mounir, Benlattar Mourad
Appl Opt. 2021 Jan 10;60(2):445-451. doi: 10.1364/AO.413041.
It is widely known that the conversion efficiency and lifetime of solar cell modules decrease with higher operating temperatures. To maximize both efficiency and reliability, solar cell modules benefit greatly from the use of daytime passive radiative cooling techniques. In this study, we introduce a simple, low-cost, double-layer coating based on porous as a daytime passive radiative cooling system to achieve sub-ambient operating temperatures in a solar cell module. The top and bottom layers of the implemented design are porous and BK7 (glass), respectively. This solar cell/radiative cooling hybrid design is capable of achieving both high solar absorption in the photovoltaic conversion band 0.3-1.1 µm and high emissivity over 0.96 in the atmospheric transparency window 8-13 µm, while rejecting parasitic solar absorption. At 800/ solar heating power, we found that adding the proposed cooling design on top of mono-crystalline silicon (m-Si), the solar cell panel lowered its operating temperature by 18.04°C, leading to a relative (effective) efficiency advantage of 21.56%. Additionally, at steady-state temperature (325 K), the power conversion efficiency of our radiative-cooler-coated m-Si solar cell is estimated to reach 20.46%, in contrast to 16.83% for an uncoated silicon solar cell. When compared with an uncoated silicon solar cell, optoelectronic simulations of our coated silicon solar cell show a short-circuit current density as high as 5.07/, and the open circuit voltage increased from 771.78 to 776.3 mV.
众所周知，太阳能电池组件的转换效率和寿命会随着工作温度的升高而降低。为了使效率和可靠性最大化，太阳能电池组件从使用日间被动辐射冷却技术中受益匪浅。在本研究中，我们引入了一种基于多孔材料的简单、低成本双层涂层，作为日间被动辐射冷却系统，以在太阳能电池组件中实现低于环境温度的工作温度。所实施设计的顶层和底层分别是多孔材料和BK7（玻璃）。这种太阳能电池/辐射冷却混合设计能够在0.3 - 1.1 µm的光伏转换波段实现高太阳能吸收率，在8 - 13 µm的大气透明窗口实现高于0.96的高发射率，同时抑制寄生太阳能吸收。在800 /太阳能加热功率下，我们发现，在单晶硅（m - Si）太阳能电池板顶部添加所提出的冷却设计后，其工作温度降低了18.04°C，产生了21.56%的相对（有效）效率优势。此外，在稳态温度（325 K）下，我们的辐射冷却涂层m - Si太阳能电池的功率转换效率估计达到20.46%，相比之下，未涂层的硅太阳能电池为16.83%。与未涂层的硅太阳能电池相比，我们的涂层硅太阳能电池的光电模拟显示短路电流密度高达5.07 /，开路电压从771.78 mV增加到776.3 mV。
