4.7 Article

Reducing transition temperature and diluting brown-yellow color of VO2 films via embedding Ag particles periodic arrays

期刊

出版社

ELSEVIER
DOI: 10.1016/j.solmat.2019.110303

关键词

Vanadium dioxide; Polystyrene; Carrier density; Transition temperature; Absorption

资金

  1. National Natural Science Foundation of China [11904299, U1930124, 11704353, 11505147, 11305162]
  2. Southwest University of Science and Technology [19ycx0066, 17LZX538, 18LZX438]
  3. Scientific Research Fund of SiChuan Provincial Education Department [18ZA0503]
  4. CAEP Foundation [YZJJLX2016001]

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In most previous investigations on VO2 smart windows, a low transition temperature (T-c) and desirable color have not been taken simultaneously, considering that they have not received enough study as yet. Here Ag particles periodic arrays (PPAs) were successfully embedded into monoclinic VO2(M) via self-assembly hexagonal-close-packed polystyrene templates. With the increase of Ag PPAs specific area, the T-c was reduced from 68 to 57.5 degrees C and the carrier density was increased. The mechanism of T-c reduction of Ag PPAs/VO2 composite films was clearly explained: more free electrons injected into VO2(M) films induces the larger absorbing energy at the nanometal-semiconductor junction. By changing the Ag PPAs specific area, the strong absorption of light in the similar to 630-730 nm (brown-yellow) band was achieved, thereby diluting the influence of the inherent brown-yellow color of the VO2(M) film. A low T-c and diluted color of the VO2(M) were simultaneously achieved by tuning Ag PPM specific area, benefiting for the smart window application.

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