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Research Article

Observation of ambipolar photoresponse from 2D MoS2/MXene heterostructure

Juntong Zhu1,3, Hao Wang2( ), Liang Ma1, Guifu Zou1( )
College of Energy,Soochow Institute for Energy and Materials Innovations, and Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University,Suzhou,215006,China;
Research Institute of Superconductor Electronics,Nanjing University,Nanjing,210023,China;
School of Physical Sciences,University of Chinese Academy of Sciences,Beijing,100190,China;
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Abstract

Two-dimensional materials have been demonstrated as promising toolboxes for optoelectronics. Transition metal carbides and nitrides (MXenes), members of an emerging family of two-dimensional materials, have drawn extensive attention in optoelectronics owing to their excellent conductivity and tunable electronic properties. Herein, a photodetector based on the two-dimensional van der Waals heterostructure of Ti3C2Tx MXene and a MoS2 monolayer was constructed to observe the ambipolar photoresponse, which showed a positive photoresponse in the visible spectrum (500–700 nm) and a negative photoresponse at longer wavelengths (700–800 nm). The device exhibited a high negative responsivity of 1.9 A/W and a detectivity of 2.1 × 1010 Jones under 750 nm light illumination. Detailed experiments demonstrate that the negative photoresponse arises from the heterostructure- induced trap energy level, which confines the excited photoelectrons and leads to an inverse current. This work demonstrates a unique optoelectronic phenomenon in MoS2/MXene heterostructures and provides valuable insights into the development of new photodetection materials.

Keywords

MXeneMoS2two-dimensional heterostructurephotodetectorambipolar photoresponse

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Nano Research
Volume 14 Issue 10,
October 2021
Pages 3416-3422
DOI: 10.1007/s12274-021-3518-5
Cite this article:
Zhu J, Wang H, Ma L, et al. Observation of ambipolar photoresponse from 2D MoS2/MXene heterostructure. Nano Research, 2021, 14(10): 3416-3422. https://doi.org/10.1007/s12274-021-3518-5
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Received: 20 January 2021
Revised: 11 April 2021
Accepted: 12 April 2021
Published: 11 May 2021
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2021
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