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Article
Ferroelectric-tuned van der Waals heterojunction with band alignment evolution
Jianlu Wang
Shanghai Institute of Technical Physics
Corresponding Author
ORCiD: https://orcid.org/0000-0002-0388-6148
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This work is licensed under a CC BY 4.0 License. Read Full License
Van der Waals (vdW) integration with abundant two-dimensional materials provides a broad basis for assembling functional devices. However, band alignment in a specific vdW heterojunction (VHJ) is difficult to tune, restricting its multifunctionality and structural simplicity. Here, we designed a ferroelectric-tuned VHJ (Fe-VHJ) device structure by integrating a GeSe/MoS2 VHJ and poly (vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE))-based ferroelectric polymer. An ultrahigh electric field derived from the ferroelectric polarization that can effectively modulate the band alignment of the GeSe/MoS2 heterojunction. Band alignment transition of the heterojunction from type II to type I was demonstrated. The combination of anisotropic GeSe with MoS2 realised a high-performance polarization-sensitive photodetector exhibiting low dark current of approximately 1.5 pA, quick response of 14 μs, and high detectivity (D*) of 4.7 × 1013 Jones. Dichroism ratios were also enhanced by ferroelectric polarization in a broad-spectrum from visible to near-infrared. The GeSe/MoS2 Fe-VHJ has great potential for multifunctional detection applications in sophisticated light information sensing. More profoundly, the Fe-VHJ structure provides a valid band-engineering approach to creating versatile devices.
Keywords
Van der Waals (vdW) integration, devices, band alignment evolution
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This preprint is under consideration at a Nature Research Journal. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Nature journals have partnered with Research Square to offer In Review, a journal-integrated preprint deposition service.
Article
Ferroelectric-tuned van der Waals heterojunction with band alignment evolution
Jianlu Wang
Shanghai Institute of Technical Physics
Corresponding Author
ORCiD: https://orcid.org/0000-0002-0388-6148
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 07 Jan, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Van der Waals (vdW) integration with abundant two-dimensional materials provides a broad basis for assembling functional devices. However, band alignment in a specific vdW heterojunction (VHJ) is difficult to tune, restricting its multifunctionality and structural simplicity. Here, we designed a ferroelectric-tuned VHJ (Fe-VHJ) device structure by integrating a GeSe/MoS2 VHJ and poly (vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE))-based ferroelectric polymer. An ultrahigh electric field derived from the ferroelectric polarization that can effectively modulate the band alignment of the GeSe/MoS2 heterojunction. Band alignment transition of the heterojunction from type II to type I was demonstrated. The combination of anisotropic GeSe with MoS2 realised a high-performance polarization-sensitive photodetector exhibiting low dark current of approximately 1.5 pA, quick response of 14 μs, and high detectivity (D*) of 4.7 × 1013 Jones. Dichroism ratios were also enhanced by ferroelectric polarization in a broad-spectrum from visible to near-infrared. The GeSe/MoS2 Fe-VHJ has great potential for multifunctional detection applications in sophisticated light information sensing. More profoundly, the Fe-VHJ structure provides a valid band-engineering approach to creating versatile devices.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Due to technical limitations, full-text HTML conversion of this manuscript could not be completed. However, the manuscript can be downloaded and accessed as a PDF.