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Rolling up MoSe 2 Nanomembranes as a Sensitive Tubular Photodetector
Author(s) -
Zhou Xuefei,
Tian Ziao,
Kim Hyuk Jin,
Wang Yang,
Xu Borui,
Pan Ruobing,
Chang Young Jun,
Di Zengfeng,
Zhou Peng,
Mei Yongfeng
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201902528
Subject(s) - photodetection , materials science , photodetector , photocurrent , optoelectronics , absorption (acoustics) , photosensitivity , diselenide , visible spectrum , nanotechnology , optics , composite material , physics , selenium , metallurgy
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.