2D Black Phosphorus/SrTiO3 -Based Programmable Photoconductive Switch

Fucai Liu; Chao Zhu; Lu You; Shi-Jun Liang; Shoujun Zheng; Jiadong Zhou; Qundong Fu; Yongmin He; Qingsheng Zeng; Hong Jin Fan; Lay Kee Ang; Junling Wang; Zheng Liu

doi:10.1002/adma.201602280

2D Black Phosphorus/SrTiO3 -Based Programmable Photoconductive Switch

Adv Mater. 2016 Sep;28(35):7768-73. doi: 10.1002/adma.201602280. Epub 2016 Jul 4.

Authors

Fucai Liu¹, Chao Zhu², Lu You³, Shi-Jun Liang⁴, Shoujun Zheng⁵, Jiadong Zhou², Qundong Fu², Yongmin He², Qingsheng Zeng², Hong Jin Fan⁵, Lay Kee Ang⁴, Junling Wang³, Zheng Liu^{6

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Affiliations

¹ Centre for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore. [email protected].
² Centre for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
³ School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
⁴ Engineering Product Development, Singapore University of Technology and Design, 8 Somapah Road, Singapore, 487372, Singapore.
⁵ Centre for Disruptive Photonic Technologies, School of Physics and Mathematics Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.
⁶ Centre for Programmable Materials, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore. [email protected].
⁷ Centre for Micro/Nano-electronics (NOVITAS), School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore. [email protected].
⁸ CINTRA CNRS/NUT/THALES, UMI 3288, Research Techno Plaze, 50 Nanyang Drive, Border X Block, Level 6, Singapore, 637553, Singapore. [email protected].

PMID: 27375185
DOI: 10.1002/adma.201602280

Abstract

A novel heterostructure is designed by stacking 2D black phosphorus (BP) on a SrTiO3 substrate. The device demonstrates programmable photoconductive switching under illumination of UV and red light. The light-tunable persistent photoconductivity exhibits a large on/off ratio exceeding 10(5) . The persistent state shows almost no relaxation or decay at low temperature. These features are suitable for a new generation of optoelectronic devices for memory application.

Keywords: 2D materials; SrTiO3; black phosphorus; heterostructure; photoconductivity.