A research team led by Prof. Fan Wei from Stanford University in the United States has recently invented a transparent refrigerating coating material that can cool the solar panels while not absorbing the sunlight, thereby improving the efficiency and durability of the solar cells. The Fan Yi team reported on the 21st in the Proceedings of the National Academy of Sciences that they used micromachining technology to etch micron-sized pores on silicon dioxide sheets to design a silica photonic crystal coating material. This material is transparent to visible light but has a strong ability to radiate heat. Solar panels using this coating can absorb as much sunlight as the temperature is reduced. Fan Yi said in an interview with Xinhua News Agency that the crystal is passively cooled, does not require electricity when working, and does not require any other input of energy. The basic principle is that the thermal radiation with a wavelength of about 10 microns is radiated into the air, because the thermal radiation of this wavelength is not absorbed and blocked by the atmosphere, so that the solar panel can be cooled. In nature, this type of cooling is common. Tests with silicon wafers have shown that this crystal can reduce the temperature of the wafer by 13 degrees Celsius. Fan said that solar cells will not convert all the absorbed sunlight into electricity, and will turn into heat without conversion. The hotter the solar cell, the lower its efficiency. If the solar panel can be lowered by 13 degrees Celsius, its working efficiency will increase by 1%. For decades, the efficiency of commercial silicon-based solar cells has increased by 0.1%, and today its overall efficiency is only about 20%, so if it can increase by 1%, it will be "very, very big progress." Concerned about surprises
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