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Eco-Friendly Transparent Silk Fibroin Radiative Cooling Film for Thermal Management of Optoelectronics

机译:Eco-Friendly Transparent Silk Fibroin Radiative Cooling Film for Thermal Management of Optoelectronics

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摘要

Although transparent radiative cooling is a passive cooling strategy with practicalapplications and aesthetic appeal, complex manufacturing processesand the use of environmentally unfriendly thermal emitters remain latentproblems. Herein, eco-friendly transparent silk radiative cooling (TSRC) filmsare developed, regenerated from natural silkworm cocoons, for zero-energyconsumptionthermal management of optoelectronic devices. These TSRCfilms can dissipate heat radiatively through molecular vibrations of the proteinbackbone and side chains, while retaining the function and appearanceof the associated devices, due to their high visible transparency. Theoreticaland experimental investigations revealed that the thermal emission increasesrapidly upon increasing the film thickness, but slowly thereafter achievessaturation; nevertheless, the intrinsic solar absorption of silk in the ultravioletand near-infrared regions also grows linearly, unavoidably weakeningthe cooling effect. After spectroscopic optimization, the maximum coolingpower during the daytime and nighttime is improved to 77.6 and 101.7 W m~(?2),respectively. Gratifyingly, the films have a remarkable effect on the coolingperformance of electronic devices under sunlight. For example, the TSRC filmprovides a temperature drop of 5.1 ℃ for a smartphone during multitaskingand charging, and 14 ℃ for a silicon solar panel with an improvement in thephotoelectronic conversion efficiency (≈7%).

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