Doping against the native propensity of MoS2: Degenerate hole doping by cation substitution

Joonki Suh, Tae Eon Park, Der Yuh Lin, Deyi Fu, Joonsuk Park, Hee Joon Jung, Yabin Chen, Changhyun Ko, Chaun Jang, Yinghui Sun, Robert Sinclair, Joonyeon Chang, Sefaattin Tongay, Junqiao Wu

Research output: Contribution to journalArticle

280 Citations (Scopus)

Abstract

Layered transition metal dichalcogenides (TMDs) draw much attention as the key semiconducting material for two-dimensional electrical, optoelectronic, and spintronic devices. For most of these applications, both n- and p-type materials are needed to form junctions and support bipolar carrier conduction. However, typically only one type of doping is stable for a particular TMD. For example, molybdenum disulfide (MoS2) is natively an n-type presumably due to omnipresent electron-donating sulfur vacancies, and stable/controllable p-type doping has not been achieved. The lack of p-type doping hampers the development of charge-splitting p-n junctions of MoS2, as well as limits carrier conduction to spin-degenerate conduction bands instead of the more interesting, spin-polarized valence bands. Traditionally, extrinsic p-type doping in TMDs has been approached with surface adsorption or intercalation of electron-accepting molecules. However, practically stable doping requires substitution of host atoms with dopants where the doping is secured by covalent bonding. In this work, we demonstrate stable p-type conduction in MoS2 by substitutional niobium (Nb) doping, leading to a degenerate hole density of μ3 × 1019 cm-3. Structural and X-ray techniques reveal that the Nb atoms are indeed substitutionally incorporated into MoS2 by replacing the Mo cations in the host lattice. van der Waals p-n homojunctions based on vertically stacked MoS2 layers are fabricated, which enable gate-tunable current rectification. A wide range of microelectronic, optoelectronic, and spintronic devices can be envisioned from the demonstrated substitutional bipolar doping of MoS2. From the miscibility of dopants with the host, it is also expected that the synthesis technique demonstrated here can be generally extended to other TMDs for doping against their native unipolar propensity.

Original languageEnglish (US)
Pages (from-to)6976-6982
Number of pages7
JournalNano Letters
Volume14
Issue number12
DOIs
StatePublished - Dec 10 2014
Externally publishedYes

Fingerprint

Cations
Substitution reactions
Positive ions
Doping (additives)
substitutes
cations
transition metals
Transition metals
Niobium
optoelectronic devices
Magnetoelectronics
conduction
niobium
Optoelectronic devices
molybdenum disulfides
homojunctions
rectification
Atoms
p-n junctions
microelectronics

Keywords

  • molybdenum disulfide
  • p -type MoS
  • p-n junction
  • substitutional doping
  • transition-metal dichalcogenides

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Suh, J., Park, T. E., Lin, D. Y., Fu, D., Park, J., Jung, H. J., ... Wu, J. (2014). Doping against the native propensity of MoS2: Degenerate hole doping by cation substitution. Nano Letters, 14(12), 6976-6982. https://doi.org/10.1021/nl503251h

Doping against the native propensity of MoS2 : Degenerate hole doping by cation substitution. / Suh, Joonki; Park, Tae Eon; Lin, Der Yuh; Fu, Deyi; Park, Joonsuk; Jung, Hee Joon; Chen, Yabin; Ko, Changhyun; Jang, Chaun; Sun, Yinghui; Sinclair, Robert; Chang, Joonyeon; Tongay, Sefaattin; Wu, Junqiao.

In: Nano Letters, Vol. 14, No. 12, 10.12.2014, p. 6976-6982.

Research output: Contribution to journalArticle

Suh, J, Park, TE, Lin, DY, Fu, D, Park, J, Jung, HJ, Chen, Y, Ko, C, Jang, C, Sun, Y, Sinclair, R, Chang, J, Tongay, S & Wu, J 2014, 'Doping against the native propensity of MoS2: Degenerate hole doping by cation substitution', Nano Letters, vol. 14, no. 12, pp. 6976-6982. https://doi.org/10.1021/nl503251h
Suh, Joonki ; Park, Tae Eon ; Lin, Der Yuh ; Fu, Deyi ; Park, Joonsuk ; Jung, Hee Joon ; Chen, Yabin ; Ko, Changhyun ; Jang, Chaun ; Sun, Yinghui ; Sinclair, Robert ; Chang, Joonyeon ; Tongay, Sefaattin ; Wu, Junqiao. / Doping against the native propensity of MoS2 : Degenerate hole doping by cation substitution. In: Nano Letters. 2014 ; Vol. 14, No. 12. pp. 6976-6982.
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AU - Jung, Hee Joon

AU - Chen, Yabin

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AU - Sun, Yinghui

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