High-Performance Transition Metal Dichalcogenide Photodetectors Enhanced by Self-Assembled Monolayer Doping

Dong Ho Kang, Myung Soo Kim, Jaewoo Shim, Jeaho Jeon, Hyung Youl Park, Woo Shik Jung, Hyun-Yong Yu, Chang Hyun Pang, Sungjoo Lee, Jin Hong Park

Research output: Contribution to journalArticle

131 Citations (Scopus)

Abstract

Most doping research into transition metal dichalcogenides (TMDs) has been mainly focused on the improvement of electronic device performance. Here, the effect of self-assembled monolayer (SAM)-based doping on the performance of WSe2- and MoS2-based transistors and photodetectors is investigated. The achieved doping concentrations are ≈1.4 × 1011 for octadecyltrichlorosilane (OTS) p-doping and ≈1011 for aminopropyltriethoxysilane (APTES) n-doping (nondegenerate). Using this SAM doping technique, the field-effect mobility is increased from 32.58 to 168.9 cm2 V-1 s in OTS/WSe2 transistors and from 28.75 to 142.2 cm2 V-1 s in APTES/MoS2 transistors. For the photodetectors, the responsivity is improved by a factor of ≈28.2 (from 517.2 to 1.45 × 104 A W-1) in the OTS/WSe2 devices and by a factor of ≈26.4 (from 219 to 5.75 × 103 A W-1) in the APTES/MoS2 devices. The enhanced photoresponsivity values are much higher than that of the previously reported TMD photodetectors. The detectivity enhancement is ≈26.6-fold in the OTS/WSe2 devices and ≈24.5-fold in the APTES/MoS2 devices and is caused by the increased photocurrent and maintained dark current after doping. The optoelectronic performance is also investigated with different optical powers and the air-exposure times. This doping study performed on TMD devices will play a significant role for optimizing the performance of future TMD-based electronic/optoelectronic applications.

Original languageEnglish
Pages (from-to)4219-4227
Number of pages9
JournalAdvanced Functional Materials
Volume25
Issue number27
DOIs
Publication statusPublished - 2015

Keywords

  • device performance
  • dichalcogenides
  • doping
  • optoelectronic devices
  • semiconductors

ASJC Scopus subject areas

  • Biomaterials
  • Electrochemistry
  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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  • Cite this

    Kang, D. H., Kim, M. S., Shim, J., Jeon, J., Park, H. Y., Jung, W. S., Yu, H-Y., Pang, C. H., Lee, S., & Park, J. H. (2015). High-Performance Transition Metal Dichalcogenide Photodetectors Enhanced by Self-Assembled Monolayer Doping. Advanced Functional Materials, 25(27), 4219-4227. https://doi.org/10.1002/adfm.201501170