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 we demonstrate a near infrared monolayer MoTe2 light emitting diode (LED) that emission 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.
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