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Lu J, Carvalho A, Chan XK, Liu H, Liu B, Tok ES, Loh KP, Castro Neto AH, Sow CH. Atomic healing of defects in transition metal dichalcogenides. Nano Lett 2015; 15:3524-32. [PMID: 25923457 DOI: 10.1021/acs.nanolett.5b00952] [Citation(s) in RCA: 96] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
As-grown transition metal dichalcogenides are usually chalcogen deficient and therefore contain a high density of chalcogen vacancies, deep electron traps which can act as charged scattering centers, reducing the electron mobility. However, we show that chalcogen vacancies can be effectively passivated by oxygen, healing the electronic structure of the material. We proposed that this can be achieved by means of surface laser modification and demonstrate the efficiency of this processing technique, which can enhance the conductivity of monolayer WSe2 by ∼400 times and its photoconductivity by ∼150 times.
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Affiliation(s)
- Junpeng Lu
- †Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542
| | - Alexandra Carvalho
- ‡Center For Advanced 2D Materials and Graphene Research Center, National University of Singapore, 6 Science Drive 2, Singapore 117546
| | - Xinhui Kim Chan
- †Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542
| | - Hongwei Liu
- §Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602
| | - Bo Liu
- ‡Center For Advanced 2D Materials and Graphene Research Center, National University of Singapore, 6 Science Drive 2, Singapore 117546
| | - Eng Soon Tok
- †Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542
| | - Kian Ping Loh
- ‡Center For Advanced 2D Materials and Graphene Research Center, National University of Singapore, 6 Science Drive 2, Singapore 117546
- ∥Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - A H Castro Neto
- †Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542
- ‡Center For Advanced 2D Materials and Graphene Research Center, National University of Singapore, 6 Science Drive 2, Singapore 117546
| | - Chorng Haur Sow
- †Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542
- ‡Center For Advanced 2D Materials and Graphene Research Center, National University of Singapore, 6 Science Drive 2, Singapore 117546
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