Ultrafast optoelectronic processes in 1d radial van der waals heterostructures: Carbon, boron nitride, and mos2 nanotubes with coexisting excitons and highly mobile charges

Maria G. Burdanova, Reza J. Kashtiban, Yongjia Zheng, Rong Xiang, Shohei Chiashi, Jack Matthew Woolley, Michael Staniforth, Emily Sakamoto-Rablah, Xue Xie, Matthew Broome, Jeremy Sloan, Anton Anisimov, Esko I. Kauppinen, Shigeo Maruyama, James Lloyd-Hughes*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Heterostructures built from 2D, atomically thin crystals are bound by the van der Waals force and exhibit unique optoelectronic properties. Here, we report the structure, composition and optoelectronic properties of 1D van der Waals heterostructures comprising carbon nanotubes wrapped by atomically thin nanotubes of boron nitride and molybdenum disulfide (MoS2). The high quality of the composite was directly made evident on the atomic scale by transmission electron microscopy, and on the macroscopic scale by a study of the heterostructure's equilibrium and ultrafast optoelectronics. Ultrafast pump-probe spectroscopy across the visible and terahertz frequency ranges identified that, in the MoS2 nanotubes, excitons coexisted with a prominent population of free charges. The electron mobility was comparable to that found in high-quality atomically thin crystals. The high mobility of the MoS2 nanotubes highlights the potential of 1D van der Waals heterostructures for nanoscale optoelectronic devices.

Original languageEnglish
Pages (from-to)3560-3567
Number of pages8
JournalNano Letters
Volume20
Issue number5
DOIs
Publication statusPublished - 13 May 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Nanotubes
  • Terahertz
  • Ultrafast
  • Van der Waals heterostructures

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