Monolayer MoSe2 grown by chemical vapor deposition for fast photodetection

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Yung-Huang Chang
  • Wenjing Zhang
  • Yihan Zhu
  • Yu Han
  • Jiang Pu
  • Jan-Kai Chang
  • Wei-Ting Hsu
  • Chang-Lung Hsu
  • Ming-Hui Chiu
  • Taishi Takenobu
  • Henan Li
  • Chih-I Wu
  • Wen-Hao Chang
  • Andrew Thye Shen Wee
  • Lain-Jong Li

Detail(s)

Original languageEnglish
Pages (from-to)8582-8590
Journal / PublicationACS Nano
Volume8
Issue number8
Publication statusPublished - 26 Aug 2014
Externally publishedYes

Abstract

Monolayer molybdenum disulfide (MoS2) has become a promising building block in optoelectronics for its high photosensitivity. However, sulfur vacancies and other defects significantly affect the electrical and optoelectronic properties of monolayer MoS2 devices. Here, highly crystalline molybdenum diselenide (MoSe2) monolayers have been successfully synthesized by the chemical vapor deposition (CVD) method. Low-temperature photoluminescence comparison for MoS2 and MoSe 2 monolayers reveals that the MoSe2 monolayer shows a much weaker bound exciton peak; hence, the phototransistor based on MoSe2 presents a much faster response time (<25 ms) than the corresponding 30 s for the CVD MoS2 monolayer at room temperature in ambient conditions. The images obtained from transmission electron microscopy indicate that the MoSe exhibits fewer defects than MoS2. This work provides the fundamental understanding for the differences in optoelectronic behaviors between MoSe2 and MoS2 and is useful for guiding future designs in 2D material-based optoelectronic devices. © 2014 American Chemical Society.

Research Area(s)

  • photoresponse, transition metal dichalcogenides, two-dimensional materials

Bibliographic Note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to lbscholars@cityu.edu.hk.

Citation Format(s)

Monolayer MoSe2 grown by chemical vapor deposition for fast photodetection. / Chang, Yung-Huang; Zhang, Wenjing; Zhu, Yihan et al.
In: ACS Nano, Vol. 8, No. 8, 26.08.2014, p. 8582-8590.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review