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WSe2/2D electron gas heterojunction on KTaO3 for room-temperature giant photoconductivity.
- Source :
-
Ceramics International . Mar2021, Vol. 47 Issue 6, p7425-7429. 5p. - Publication Year :
- 2021
-
Abstract
- Van der Waals (vdW) heterojunctions, based on 2D systems, show great potential as high-performance photodetectors. Recent advances have reported an Ar+-ion-bombardment assistant method to achieve a vdW heterojunction between a 2D-material and a 2D electron gas (2DEG). Here, we fabricate a vdW heterojunction between WSe 2 and 2DEG on KTaO 3. Under visible light illumination, a giant photoconductivity is observed with bias voltage applied at room temperature. Such a device exhibits an instantaneous photoelectric response to on/off light illumination. The ratio of on/off currents reaches as high as 104. In the wavelength range of 405–808 nm, the photoresponsivity is much greater for shorter wavelengths, reaching a maximum of 1.84 A/W. Moreover, even without bias voltage, the WSe 2 /2DEG heterojunction still generates a short-circuit photocurrent due to the photovoltaic effect, implying a self-powered photodetector. This work paves a path towards high-performance photoelectric devices based on vdW heterojunctions of 2D-material/2DEG. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02728842
- Volume :
- 47
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Ceramics International
- Publication Type :
- Academic Journal
- Accession number :
- 148884974
- Full Text :
- https://doi.org/10.1016/j.ceramint.2020.11.081