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Broadband Optical‐Fiber‐Compatible Photodetector Based on a Graphene‐MoS 2 ‐WS 2 Heterostructure with a Synergetic Photogenerating Mechanism
Author(s) -
Xiong YiFeng,
Chen JinHui,
Lu YanQing,
Xu Fei
Publication year - 2019
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201800562
Subject(s) - materials science , heterojunction , optoelectronics , photocurrent , photodetector , graphene , photoconductivity , optical fiber , responsivity , absorption (acoustics) , chemical vapor deposition , nanotechnology , optics , composite material , physics
Integrating 2D crystals into optical fibers can grant them optoelectronic properties and extend their range of applications. However, the ability to produce complicated structures is limited by the challenges of chemical vapor deposition manufacturing. Here, a 2D‐material heterostructure created on a fiber end‐face is successfully demonstrated by integrating a microscale multilayer graphene‐MoS 2 ‐WS 2 heterostructure film on it, using a simple layer‐by‐layer transferring method. The all‐in‐fiber photodetector (FPD) exhibits an ultrahigh photoresponsivity of ≈6.6 × 10 7 A·W −1 and a relatively fast time response of ≈7 ms at 400 nm light wavelength, due to the strong light absorption and the built‐in electric field of the heterostructure. Moreover, owing to the type‐II staggered band alignments in the MoS 2 ‐WS 2 heterostructure, the interlayer optical transition between the MoS 2 and WS 2 layers enables the FPD to sense the infrared light, displaying a photoresponsivity of ≈17.1 A·W −1 at 1550 nm. In addition, an inverse photoresponse is observed under high illuminating powers, indicating a competing photocurrent generation mechanism, comprising the photoconductive and photobolometric effects. It is believed that the findings will offer a new strategy for the development of novel all‐fiber optoelectronic devices based on 2D crystals.