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.
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12 December 2022
Research Article|
December 13 2022
Large increase in photo-induced conductivity of two-dimensional electron gas at SrTiO3 surface with BiFeO3 topping layer
Special Collection:
Metal Oxide Thin-Film Electronics
Peerawat Laohana
;
Peerawat Laohana
(Investigation, Methodology, Writing – original draft)
1
School of Physics and Center of Excellence on Advanced Functional Materials, Suranaree University of Technology
, Nakhon Ratchasima 30000, Thailand
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Siwat Polin
;
Siwat Polin
(Conceptualization, Investigation, Methodology)
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
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Warakorn Jindata
;
Warakorn Jindata
(Writing – original draft, Writing – review & editing)
1
School of Physics and Center of Excellence on Advanced Functional Materials, Suranaree University of Technology
, Nakhon Ratchasima 30000, Thailand
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Aissara Rasritat;
Aissara Rasritat
(Resources)
1
School of Physics and Center of Excellence on Advanced Functional Materials, Suranaree University of Technology
, Nakhon Ratchasima 30000, Thailand
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Tanachat Eknapakul
;
Tanachat Eknapakul
(Conceptualization, Resources)
1
School of Physics and Center of Excellence on Advanced Functional Materials, Suranaree University of Technology
, Nakhon Ratchasima 30000, Thailand
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Pimchanok Leuasoongnoen
;
Pimchanok Leuasoongnoen
(Resources, Software)
3
Synchrotron Light Research Institute
, Nakhon Ratchasima 30000, Thailand
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Supree Pinitsoontorn
;
Supree Pinitsoontorn
(Resources)
4
Department of Physics, Faculty of Science, Khon Kaen University
, Khon Kaen 40002, Thailand
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Pattanaphong Janphuang;
Pattanaphong Janphuang
(Resources, Software)
3
Synchrotron Light Research Institute
, Nakhon Ratchasima 30000, Thailand
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Wittawat Saenrang
;
Wittawat Saenrang
(Conceptualization, Methodology, Project administration, Supervision, Visualization, Writing – original draft)
1
School of Physics and Center of Excellence on Advanced Functional Materials, Suranaree University of Technology
, Nakhon Ratchasima 30000, Thailand
5
Research Network NANOTEC–SUT on Advanced Nanomaterials and Characterization, Suranaree University of Technology
, Nakhon Ratchasima 30000, Thailand
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Worawat Meevasana
Worawat Meevasana
a)
(Conceptualization, Project administration, Supervision, Visualization, Writing – original draft, Writing – review & editing)
1
School of Physics and Center of Excellence on Advanced Functional Materials, Suranaree University of Technology
, Nakhon Ratchasima 30000, 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
a)Author to whom correspondence should be addressed: worawat@g.sut.ac.th
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a)Author to whom correspondence should be addressed: worawat@g.sut.ac.th
Note: This paper is part of the APL Special Collection on Metal Oxide Thin-Film Electronics.
Appl. Phys. Lett. 121, 241601 (2022)
Article history
Received:
August 31 2022
Accepted:
November 29 2022
Citation
Peerawat Laohana, Siwat Polin, Warakorn Jindata, Aissara Rasritat, Tanachat Eknapakul, Pimchanok Leuasoongnoen, Supree Pinitsoontorn, Pattanaphong Janphuang, Wittawat Saenrang, Worawat Meevasana; Large increase in photo-induced conductivity of two-dimensional electron gas at SrTiO3 surface with BiFeO3 topping layer. Appl. Phys. Lett. 12 December 2022; 121 (24): 241601. https://doi.org/10.1063/5.0123578
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