Rolling up MoSe2 Nanomembranes as a Sensitive Tubular Photodetector

Xuefei Zhou, Ziao Tian, Hyuk Jin Kim, Yang Wang, Borui Xu, Ruobing Pan, Young Jun Chang, Zengfeng Di, Peng Zhou, Yongfeng Mei

Research output: Contribution to journalArticlepeer-review

63 Scopus citations

Abstract

Transition metal dichalcogenides, as a kind of 2D material, are suitable for near-infrared to visible photodetection owing to the bandgaps ranging from 1.0 to 2.0 eV. However, limited light absorption restricts photoresponsivity due to the ultrathin thickness of 2D materials. 3D tubular structures offer a solution to solve the problem because of the light trapping effect which can enhance optical absorption. In this work, thanks to mechanical flexibility of 2D materials, self-rolled-up technology is applied to build up a 3D tubular structure and a tubular photodetector is realized based on the rolled-up molybdenum diselenide microtube. The tubular device is shown to present one order higher photosensitivity compared with planar counterparts. Enhanced optical absorption arising from the multiple reflections inside the tube is the main reason for the increased photocurrent. This tubular device offers a new design for increasing the efficiency of transition metal dichalcogenide–based photodetection and could hold great potential in the field of 3D optoelectronics.

Original languageEnglish
Article number1902528
JournalSmall
Volume15
Issue number42
DOIs
StatePublished - 1 Oct 2019

Keywords

  • MoSe
  • photosensitivity
  • rolling-up
  • tubular photodetectors

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