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Probing the photocurrent in two-dimensional titanium disulfide.
Ruan Zhang1,2, Shuangxing Zhu1,2, Jiaxin Wu1,2
1National Key Laboratory of Advanced Micro and Nano Manufacture Technology, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
Nanotechnology
|October 5, 2023
Summary
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
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.
