High-Efficiency Monolayer Molybdenum Ditelluride Light-Emitting Diode and Photodetector

Developing a high-efficiency and low-cost light source with emission wavelength transparent to silicon is an essential step toward silicon-based nanophotonic devices and micro/nano industry platforms. Here, a near-infrared monolayer MoTe2 light-emitting diode (LED) has been demonstrated and its emis...

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Bibliographic Details
Published in:ACS applied materials & interfaces 2018-12, Vol.10 (50), p.43291-43298
Main Authors: Zhu, Yi, Li, Ziyuan, Zhang, Linglong, Wang, Bowen, Luo, Zhenqing, Long, Jianzheng, Yang, Jiong, Fu, Lan, Lu, Yuerui
Format: Article
Language:English
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Summary:Developing a high-efficiency and low-cost light source with emission wavelength transparent to silicon is an essential step toward silicon-based nanophotonic devices and micro/nano industry platforms. Here, a near-infrared monolayer MoTe2 light-emitting diode (LED) has been demonstrated and its emission wavelength is transparent to silicon. By taking advantage of the quantum tunneling effect, the device has achieved a very high external quantum efficiency (EQE) of 9.5% at 83 K, which is the highest EQE obtained from LED devices fabricated from monolayer TMDs so far. When the device is operated as a photodetector, the MoTe2 device exhibits a strong photoresponsivity at resonant wavelength 1145 nm. The low dark current of ∼5pA and fast response time 5.06 ms are achieved due to suppression of hBN tunneling layer. Our results open a new route for the investigation of novel near-infrared silicon integrated optoelectronic devices.
ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.8b14076