Large increase in photo-induced conductivity of two-dimensional electron gas at SrTiO<sub>3</sub> surface with BiFeO<sub>3</sub> topping layer-Reference-Cited by-同舟云学术

Large increase in photo-induced conductivity of two-dimensional electron gas at SrTiO₃ surface with BiFeO₃ topping layer

Published:2022-12-12 Issue:24 Volume:121 Page:241601
ISSN:0003-6951
Container-title:Applied Physics Letters
language:en
Short-container-title:Appl. Phys. Lett.

Author:

Laohana Peerawat¹^ORCID,Polin Siwat¹²^ORCID,Jindata Warakorn¹^ORCID,Rasritat Aissara¹,Eknapakul Tanachat¹^ORCID,Leuasoongnoen Pimchanok³^ORCID,Pinitsoontorn Supree⁴^ORCID,Janphuang Pattanaphong³,Saenrang Wittawat¹⁵^ORCID,Meevasana Worawat¹⁵⁶^ORCID

Affiliation:

1. School of Physics and Center of Excellence on Advanced Functional Materials, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand

2. Faculty of Science and Technology, Rajamangala University of Technology Suvarnabhumi, Nonthaburi 11000, Thailand

3. Synchrotron Light Research Institute, Nakhon Ratchasima 30000, Thailand

4. Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand

5. Research Network NANOTEC–SUT on Advanced Nanomaterials and Characterization, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand

6. China-Thailand Joint Research Center of Physics, Harbin Engineering University, People’s Republic of China and Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand

Abstract

In this work, we study and compare the photo-induced conductivity of a two-dimensional electron gas (2DEG) at the bare surface of SrTiO3 (STO) and in the heterostructure of BiFeO3 (BFO) and STO, where BFO was deposited by radio frequency magnetron sputtering. The photo-induced conductance of the BFO/STO interface shows a large increase which is 20.62 times more than the sum of photo-induced conductance from each individual BFO thin film and STO crystal. Since this photo-induced conductance of the BFO/STO heterostructure can be adjusted to become higher and lower by applying an electric field to the top surface, we attribute this large increase to the strong photo-induced electrical polarization of BFO. With the two-point setup of positive bias and negative bias, the conductivity also exhibits diode-like behavior where the forward and backward resistances are different. This work provides methods to interplay between light irradiation, electric field, and conductivity in all-oxide electronics.

Funder

NSRF via the PMU B

Thailand Science Research and Innovation

Publisher

AIP Publishing

Subject

Physics and Astronomy (miscellaneous)

Link

https://aip.scitation.org/doi/pdf/10.1063/5.0123578

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