期刊
NANO ENERGY
卷 104, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2022.107972
关键词
GeSe2; Wide-bandgap 2D material; VdW heterojunction; Self-powered; Ultraviolet imaging
类别
资金
- National Natural Science Foundation of China
- Natural Science Foundation of Henan Province, China
- Henan Provincial Key Science and Technology Research Projects
- [U2004165]
- [U22A20138]
- [91833303]
- [11974016]
- [202300410376]
- [212102210131]
This article presents a synthesis method for inch-level 2D GeSe2 layers and demonstrates their potential in UV detection and imaging. The GeSe2 layers synthesized via a post-annealing approach exhibit precise layer control, customized patterns, and excellent UV photoresponse characteristics.
Emerging wide-bandgap 2D GeSe2 has been considered as a promising candidate for next-generation ultraviolet (UV) imaging systems, which typically require miniaturization, high stability, and self-powered sensing capa-bility. Nevertheless, the lack of reliable wafer-scale synthesis strategies remains a major obstacle to unleashing its full device potential. Herein, we report the synthesis of inch-level 2D GeSe2 layers with precise layer control and customized patterns via a facile post-annealing approach, which reveals a layer-independent direct bandgap of-3.0 eV. Moreover, high-quality GeSe2/GaN mixed-dimensional van der Waals heterojunctions fabricated via in -situ growth mode display an ultrasensitive self-powered UV photoresponse with a UV-to-visible rejection ratio of 1.8 x 105, a large responsivity of 261.7 mA/W, a high specific detectivity of 1.24 x 1014 Jones, as well as an ultrafast response speed to track nanosecond pulsed UV signals. In particular, the photodetector could sense ultraweak UV signals with a minimum detection limit of 180 pW/cm2 at 360 nm. Besides, the large-area growth of GeSe2 enables the implementation of integrated photodiode arrays for the self-powered image sensor, demonstrating the great promise of 2D GeSe2 for high-sensitivity UV detection and imaging.
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