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Title: Optically Controllable 2D Material/Complex Oxide Heterointerface
Authors: Tao Liu 
Cheng Han
Du Xiang 
Kun Han 
Ariando Ariando 
Wei Chen 
Keywords: amorphous strontium titanium oxide (a-STO)
MoTe2/a-STO heterostructures
optically controllable interfacial states
polarity tunable photoresponses
Issue Date: 20-Aug-2020
Publisher: WILEY
Citation: Tao Liu, Cheng Han, Du Xiang, Kun Han, Ariando Ariando, Wei Chen (2020-08-20). Optically Controllable 2D Material/Complex Oxide Heterointerface. Advanced Science 7 (21). ScholarBank@NUS Repository.
Abstract: 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) MoTe2 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 Oδ‐ ions. The photoresponsivity and the specific detectivity are found to be >104 AW‐1 and >1013 Jones, respectively, which are significantly higher than those in standard MoTe2 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.
Source Title: Advanced Science
ISSN: 21983844
DOI: 10.1002/advs.202002393
Appears in Collections:Staff Publications

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