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Optically Controllable 2D Material/Complex Oxide Heterointerface.

Tao Liu1,2, Cheng Han1, Du Xiang2

  • 1SZU-NUS Collaborative Innovation Center for Optoelectronic Science & Technology International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics Shenzhen University Shenzhen 518060 P. R. China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 11, 2020
PubMed
Summary
This summary is machine-generated.

This study introduces a novel photodetector using a 2D molybdenum ditelluride (MoTe2) and amorphous strontium titanium oxide (a-STO) heterostructure. This device shows exceptional performance and a unique, tunable photoresponse for advanced optoelectronic applications.

Keywords:
MoTe2/a‐STO heterostructuresamorphous strontium titanium oxide (a‐STO)optically controllable interfacial statespolarity tunable photoresponses

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Heterostructures are crucial for functional devices, with non-conventional types offering novel scientific and technological possibilities.
  • Two-dimensional (2D) materials integrated with distinct materials enable unique phenomena.
  • Amorphous strontium titanium oxide (a-STO) is a promising material for electronic applications.

Purpose of the Study:

  • To report a novel heterostructure based on 2D molybdenum ditelluride (MoTe2) and amorphous strontium titanium oxide (a-STO).
  • To investigate the photodetection properties of this MoTe2/a-STO heterostructure, including its photoresponse and detectivity.
  • To explore the dynamic evolution of photodetection behavior and its underlying mechanisms.

Main Methods:

  • Fabrication of a heterostructure comprising 2D MoTe2 and a-STO thin film.
  • Characterization of the device's photoresponse under illumination.
  • Analysis of interfacial states using X-ray photoelectron spectroscopy (XPS) and photoluminescence (PL) measurements.

Main Results:

  • The MoTe2/a-STO heterostructure functions as a high-performance photodetector with photoresponsivity >10^4 AW^-1 and specific detectivity >10^13 Jones.
  • An anomalous negative photoresponse was observed in the pristine device, attributed to light-induced O^δ- ion scattering.
  • The photodetection behavior dynamically evolved from negative to positive by tuning light programming time, indicating optically controllable interfacial state modulation.

Conclusions:

  • The MoTe2/a-STO heterostructure demonstrates superior photodetection performance compared to standard MoTe2 devices.
  • The observed tunable photoresponse highlights the potential for optically controlled interfacial engineering.
  • This 2D material/a-STO heterostructure serves as a promising platform for developing new functional optoelectronic devices.