Highly Sensitive Polarization Photodetection Using a Pseudo-One-Dimensional Nb (1- x) Ti x S 3 Alloy

Shengxue Yang, Minghui Wu, Wanfu Shen, Li Huang, Sefaattin Tongay, Kedi Wu, Bin Wei, Ying Qin, Zhongchang Wang, Chengbao Jiang, Chunguang Hu

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Low-symmetry layered two-dimensional (2D) materials with strong in-plane optical anisotropy can potentially be applied for polarization photodetection. This is especially true for those 2D materials with a direct band gap, which can efficiently absorb light with specific axial polarization. However, discovering such new anisotropic 2D materials with a direct band structure is still extremely challenging. Here, we fabricate a photodetector using a pseudo-one-dimensional (pseudo-1D) Nb (1-x) Ti x S 3 alloy device and demonstrate that it is highly sensitive to the polarized light because of the strong in-plane optical anisotropy and direct band gap of the alloy by combining angle-resolved polarization Raman spectroscopy, azimuth-dependent reflectance difference microscopy, polarization-dependent absorption spectroscopy, and hybrid functional theory calculations. As a consequence, the polarization photodetector of the Nb (1-x) Ti x S 3 alloy shows a large photocurrent anisotropic ratio and a high photoresponse. The choice of a low-symmetry layered pseudo-1D Nb (1-x) Ti x S 3 alloy in polarization photodetection might open up new functionalities for novel optoelectronic device applications.

Original languageEnglish (US)
Pages (from-to)3342-3350
Number of pages9
JournalACS Applied Materials and Interfaces
Volume11
Issue number3
DOIs
StatePublished - Jan 23 2019

Keywords

  • Nb Ti S ternary alloy
  • in-plane optical anisotropy
  • low-symmetry structure
  • polarization-sensitive photodetector
  • pseudo-one-dimensional materials

ASJC Scopus subject areas

  • Materials Science(all)

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