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Ko, Hyunhyub
Functional Nanomaterials & Devices Lab
Research Interests
  • Functional nanomaterials, flexible electronics, electronic skins, wearable sensors

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High-Performance MoS2/CuO Nanosheet-on-One-Dimensional Heterojunction Photodetectors

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Title
High-Performance MoS2/CuO Nanosheet-on-One-Dimensional Heterojunction Photodetectors
Author
Um, Doo-SeungLee, YoungsuLim, SeongdongPark, SeungyoungLee, HochanKo, Hyunhyub
Keywords
CuO nanowire; MoS2; nanosheet-on-1D heterojunction; photodetector; wet-transfer printing
Issue Date
201612
Publisher
AMER CHEMICAL SOC
Citation
ACS APPLIED MATERIALS & INTERFACES, v.8, no.49, pp.33955 - 33962
Abstract
van der Waals heterostructures based on stacked two-dimensional (2D) materials provide novel device structures enabling high-performance electronic and optoelectronic devices. While 2D–2D or 2D–bulk heterostructures have been largely explored for fundamental understanding and novel device applications, 2D–one-dimensional (1D) heterostructures have been rarely studied because of the difficulty in achieving high-quality heterojunctions between 2D and 1D structures. In this study, we introduce nanosheet-on-1D van der Waals heterostructure photodetectors based on a wet-transfer printing of a MoS2 nanosheet on top of a CuO nanowire (NW). MoS2/CuO nanosheet-on-1D photodetectors show an excellent photocurrent rectification ratio with an ideality factor of 1.37, which indicates the formation of an atomically sharp interface and a high-quality heterojunction in the MoS2/CuO heterostructure by wet-transfer-enhanced van der Waals bonding. Furthermore, nanosheet-on-1D heterojunction photodetectors exhibit excellent photodetection capabilities with an ultrahigh photoresponsivity (∼157.6 A/W), a high rectification ratio (∼6000 at ±2 V), a low dark current (∼38 fA at −2 V), and a fast photoresponse time (∼34.6 and 51.9 ms of rise and decay time), which cannot be achievable with 1D-on-nanosheet heterojunction photodetectors. The wet-transfer printing of nanosheet-on-1D heterostructures introduced in this study provides a robust platform for the fundamental study of various combinations of 2D-on-1D heterostructures and their applications in novel heterojunction devices.
URI
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DOI
http://dx.doi.org/10.1021/acsami.6b12574
ISSN
1944-8244
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