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Probing the photocurrent in two-dimensional titanium disulfide.

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Researchers studied the photoresponse of titanium disulfide (TiS2), a debated material. They found photovoltaic current at the metal/TiS2 junction and negative photoconductivity in the TiS2 channel, suggesting it

Keywords:
SPCMbolometric effectphotovoltaicsthin-film TiS2

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Optoelectronics

Background:

  • Photocurrent generation probes non-equilibrium carrier dynamics and electronic band structure.
  • Titanium disulfide (TiS2), a transition metal dichalcogenide, has a debated classification as semimetal or semiconductor.

Purpose of the Study:

  • To analyze the photoresponse of mechanically exfoliated TiS2.
  • To elucidate the photocurrent generation mechanism in 2D TiS2.
  • To investigate the optoelectronic properties of TiS2.

Main Methods:

  • Scanning photocurrent microscopy
  • Temperature-dependent photoresponse characterization
  • Electrical transport characterization
  • Angle-resolved photoemission spectroscopy (ARPES)

Main Results:

  • A photovoltaic current was observed at the metal/TiS2 junction in an unbiased sample.
  • Negative photoconductivity, attributed to the bolometric effect, was detected in the TiS2 channel.
  • Experimental results suggest the studied TiS2 is a heavily-doped semiconductor.

Conclusions:

  • The study reveals the photocurrent generation mechanism in 2D TiS2.
  • Findings highlight the potential optoelectronic applications of TiS2.
  • The research contributes to understanding the electronic properties of TiS2.