Broad-Band Photocurrent Enhancement in MoS2 Layers Directly Grown on Light-Trapping Si Nanocone Arrays

Yunae Cho, Byungjin Cho, Yonghun Kim, Jihye Lee, Eunah Kim, Trang Thi Thu Nguyen, Ju Hyun Lee, Seokhyun Yoon, Dong Ho Kim, Jun Hyuk Choi, Dong Wook Kim

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

There has been growing research interest in realizing optoelectronic devices based on the two-dimensional atomically thin semiconductor MoS2 owing to its distinct physical properties that set it apart from conventional semiconductors. However, there is little optical absorption in these extremely thin MoS2 layers, which presents an obstacle toward applying them for use in high-efficiency light-absorbing devices. We synthesized trilayers of MoS2 directly on SiO2/Si nanocone (NC) arrays using chemical vapor deposition and investigated their photodetection characteristics. The photoresponsivity of the MoS2/NC structure was much higher than that of the flat counterpart across the whole visible wavelength range (for example, it was almost an order of magnitude higher at λ = 532 nm). Strongly concentrated light near the surface that originated from a Fabry-Perot interference in the SiO2 thin layers and a Mie-like resonance caused by the Si NCs boosted the optical absorption in MoS2. Our work demonstrates that MoS2/NC structures could provide a useful means to realize high-performance optoelectronic devices.

Original languageEnglish
Pages (from-to)6314-6319
Number of pages6
JournalACS Applied Materials and Interfaces
Volume9
Issue number7
DOIs
StatePublished - 22 Feb 2017

Keywords

  • chemical vapor deposition
  • MoS
  • nanocone
  • photoresponse
  • Si

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