@article{Zhu2021, 
author = {Juntong Zhu and Hao Wang and Liang Ma and Guifu Zou},
title = {Observation of ambipolar photoresponse from 2D MoS2/MXene heterostructure},
year = {2021},
journal = {Nano Research},
volume = {14},
number = {10},
pages = {3416-3422},
keywords = {MoS2, MXene, photodetector, two-dimensional heterostructure, ambipolar photoresponse},
url = {https://www.sciopen.com/article/10.1007/s12274-021-3518-5},
doi = {10.1007/s12274-021-3518-5},
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.}
}