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Optically Controllable 2D Material/Complex Oxide Heterointerface
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DOI：10.1002/advs.202002393.png)
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Abstract
En 中文
Heterostructures play a vital role in functional devices on the basis of the individual constituents. Non-conventional heterostructures formed by stacking 2D materials onto structurally distinct materials are of great interest in achieving novel phenomena that are both scientifically and technologically relevant. Here, a heterostructure based on a 2D (molybdenum ditelluride) MoTe(2)and an amorphous strontium titanium oxide (a-STO) thin film is reported. The heterostructure functions as a high-performance photodetector, which exhibits anomalous negative photoresponse in the pristine device due to the scattering effect from the light-induced O(delta-)ions. The photoresponsivity and the specific detectivity are found to be >10(4)AW(-1)and >10(13)Jones, respectively, which are significantly higher than those in standard MoTe(2)devices. Moreover, through tuning the light programming time, the photodetection behavior of the MoTe2/a-STO heterostructure experiences a dynamic evolution from negative to positive. This is due to the optically controllable modulation of the interfacial states, which is further confirmed by the X-ray photoelectron spectroscopy and photoluminescence measurements. It is envisioned that the 2D material/a-STO heterostructure could be a potential platform for exploring new functional devices.
Keywords:
amorphous strontium titanium oxide (a-STO)
MoTe2
a-STO heterostructures
optically controllable interfacial states
polarity tunable photoresponses
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