Graphene/In2S3 van der Waals Heterostructure for Ultrasensitive Photodetection
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AbstractAs an emerging 2D nonlayered material, natural defective beta-In2S3 nanosheets have drawn attention because of their unique defective structure and broad optical detection range. Stacking n-type In2S3 with other p-type 2D materials can produce an atomically sharp interface with van der Waals interaction, which may lead to high performance in (opto)electronics. In this study, we fabricated a van der Waals heterostructure composed of In2S3 and graphene via the dry transfer method. Scanning Kelvin probe force microscopy revealed a significant potential difference at the interface of the heterostructure, thereby endowing it with good diode characteristics. The back-gate field effect transistor based on the graphene/In2S3 heterostructure exhibited excellent gate-tunable current-rectifying characteristic with n-type semiconductor behavior. A photodetector based on the graphene/In2S3 heterostructure showed excellent response to visible light. Particularly, an ultrahigh responsivity of 795 A/W and an external quantum efficiency of 2440% are recorded under the illumination of 405 nm light and can be further increased to 8570 A/W and 26 200% with a positive gate voltage of 60 V. The excellent optical responsive performance is attributed to the synergy of photoconductive and photogating effects. These intriguing results suggest that the graphene/In2S3 heterostructure has prospective applications in future electronic and optoelectronic devices.
All Author(s) ListLu JT, Wei AX, Zhao Y, Tao LL, Yang YB, Zheng ZQ, Wang H, Luo DX, Liu J, Tao L, Li H, Li JB, Xu JB
Journal nameACS Photonics
Volume Number5
Issue Number12
Pages4912 - 4919
LanguagesEnglish-United Kingdom
KeywordsIn2S3, graphene, van der Waals heterostructure, photodetector, field effect transistor, two-dimensional material
Web of Science Subject CategoriesNanoscience & Nanotechnology;Materials Science, Multidisciplinary;Optics;Physics, Applied;Physics, Condensed Matter;Science & Technology - Other Topics;Materials Science;Optics;Physics

Last updated on 2021-13-10 at 23:42