4.4 Article

Mid-infrared complex permittivity in Bi2-xSbxTe3-ySey thin films synthesized using a combinatorial method

期刊

THIN SOLID FILMS
卷 757, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2022.139406

关键词

Plasmonic materials; Mid -infrared; Combinatorial materials libraries

资金

  1. National Natural Science Foundation of China (NSFC) [61675223]
  2. Shandong Natural Science Foundation [ZR2017MF018]
  3. Innovation Program in Shanghai Institute of Technical Physics, Chinese Academy of Sciences [CX-173]

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The study reveals that Bi-based chalcogenide semiconductor alloys, through composition modulation, exhibit wide tunability in mid-infrared plasmonic properties. This research contributes to the development of highly important technologies.
Successful employment of plasmonics-inspired solutions in the mid-infrared frequency range would benefit a number of highly important technologies. As a plasmonic material beyond gold and silver, Bi-based chalcogenide semiconductor alloys exhibit a wide tunability in the spectral dispersion of relative permittivity by varying the composition of their ternary and quaternary compounds. In our investigation, a combinatorial materials library of Bi2-xSbxTe3-ySey thin films were synthesized. The complete solid solubility and the in-depth chemical composition profile of thin film pixels in the library were confirmed using micro-area X-ray diffraction and secondary ion mass spectroscopy, respectively. The stoichiometries of thin film pixels were acquired using the energy dispersive X-ray analysis. The mid-infrared spectral transmittance was measured using a Fouriertransform infrared spectrometer. The complex permittivity epsilon(omega) in the spectral range from 2.5 to 15 mu m was derived by fitting spectral transmittance to the Drude-Lorentz equation. It can be demonstrated that the negative values of real part of permittivity, epsilon r, emerge at the shorter wavelengths. The crossover wavelength, at which epsilon r crosses zero from negative to positive, can shift from 5.346 mu m for Bi2Se3 to 9.232 mu m for Sb2Te3 with the increasing of x and the deceasing of y. Therefore, an exceptionally wide and potentially interesting mid-infrared plasmonic property, which is compositionally adjustable, can be carried out for evaporation-deposited Bi2-xSbxTe3-ySey solid-solution thin films.

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