First principles investigation on Li or Sn codoped hexagonal tungsten bronzes as the near-infrared shielding material |
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| Affiliation: | 1.Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;2.College of Physics, Jilin University, Changchun 130012, China |
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| Abstract: | The 52% energy of the solar radiation is contributed by near-infrared radiation (NIR, 780-2500 nm). Therefore, the material design for the energy-saving smart window, which can effectively shield NIR and has acceptable visible transmittance, is vital to save the energy consumed on the temperature control system. It is important to find a non-toxic stable material with excellent NIR-shielding ability and acceptable visible transmittance. The systematic first-principles study on LixSnyWO3 (x=0, 0.33, 0.66, and y=0, 0.33) exhibits that the chemical stability is a positive correlation with the doping concentration. After doping, the Fermi-energy upshifts into the conduction band, and the material shows metal-like characteristics. Therefore, these structures LixSnyWO3 (except the structure with x=0.33 and y=0) show pronounced improvement of NIR shielding ability. Our results indicate that when x=0 and y=0.33, the material exhibits the strongest NIR-shielding ability, satisfying chemical stability, wide NIR-shielding range (780-2500 nm), and acceptable visible transmittance. This work provides a good choice for experimental study on NIR shielding material for the energy-saving window. |
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| Keywords: | density functional theory electronic structure near-infrared radiation shielding material |
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