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Wiley, Small, 40(19), 2023

DOI: 10.1002/smll.202301723



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A Highly Transparent Photo‐Electro‐Thermal Film with Broadband Selectivity for All‐Day Anti‐/De‐Icing

This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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AbstractA photo‐ and electro‐thermal film can convert sunlight and electricity into heat to solve icing problems. Combination of them provides an efficient strategy for all‐day anti‐/de‐icing. However, only opaque surfaces have been reported, due to the mutual exclusiveness between photon absorption and transmission. Herein, a highly transparent and scalable solution‐processed photo‐electro‐thermal film is reported, which exhibits an ultra‐broadband selective spectrum to separate the visible light from sunlight and a countertrend suppress of emission in longer wavelength. It absorbs ≈ 85% of invisible sunlight (ultraviolet and near‐infrared) for light‐heat conversion, meanwhile maintains luminous transmittance > 70%. The reflection of mid‐infrared leads to low emissivity (0.41), which further preserves heat on the surface for anti‐/de‐icing purpose. This ultra‐broadband selectivity enables temperature elevation > 40 °C under 1‐sun illumination and the mutual support between photo‐thermal and electro‐thermal effects contributes to > 50% saving of electrical consumption under weak solar exposure (0.4‐sun) for maintaining unfrozen surfaces at −35 °C environment. The reverberation from photo‐electro‐thermal and super‐hydrophobic effects illustrates a lubricating removal of grown ice in short time (< 120 s). The self‐cleaning ability and the durability under mechanical, electrical, optical, and thermal stresses render the film stable for long‐term usage in all‐day anti‐/de‐icing applications.