SnSe2 Quantum Dots: Facile Fabrication and Application in Highly Responsive UV-Detectors

Xiangyang Li; Ling Li; Huancheng Zhao; Shuangchen Ruan; Wenfei Zhang; Peiguang Yan; Zhenhua Sun; Huawei Liang; Keyu Tao

doi:10.3390/nano9091324

SnSe₂ Quantum Dots: Facile Fabrication and Application in Highly Responsive UV-Detectors

Nanomaterials (Basel). 2019 Sep 15;9(9):1324. doi: 10.3390/nano9091324.

Authors

Xiangyang Li¹, Ling Li², Huancheng Zhao³, Shuangchen Ruan⁴, Wenfei Zhang⁵, Peiguang Yan⁶, Zhenhua Sun⁷, Huawei Liang⁸, Keyu Tao⁹

Affiliations

¹ Shenzhen Key Laboratory of Laser Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. 2170285209@email.szu.edu.cn.
² Shenzhen Key Laboratory of Laser Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. liling@szu.edu.cn.
³ Shenzhen Key Laboratory of Laser Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. 1800281011@email.szu.edu.cn.
⁴ Shenzhen Key Laboratory of Laser Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. scruan@szu.edu.cn.
⁵ Shenzhen Key Laboratory of Laser Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. zhangwf@szu.edu.cn.
⁶ Shenzhen Key Laboratory of Laser Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. yanpg@szu.edu.cn.
⁷ Shenzhen Key Laboratory of Laser Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. szh@szu.edu.cn.
⁸ Shenzhen Key Laboratory of Laser Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. hwliang@szu.edu.cn.
⁹ Shenzhen Key Laboratory of Laser Engineering, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China. taokeyu@szu.edu.cn.

Abstract

Synthesizing quantum dots (QDs) using simple methods and utilizing them in optoelectronic devices are active areas of research. In this paper, we fabricated SnSe₂ QDs via sonication and a laser ablation process. Deionized water was used as a solvent, and there were no organic chemicals introduced in the process. It was a facile and environmentally-friendly method. We demonstrated an ultraviolet (UV)-detector based on monolayer graphene and SnSe₂ QDs. The photoresponsivity of the detector was up to 7.5 × 10⁶ mAW^-1, and the photoresponse time was ~0.31 s. The n-n heterostructures between monolayer graphene and SnSe₂ QDs improved the light absorption and the transportation of photocarriers, which could greatly increase the photoresponsivity of the device.

Keywords: SnSe2 quantum dots; UV-detector; graphene; phototransistor.

Grants and funding

JCYJ20180305125000525, JCYJ20170302151033006, and JCYJ20160328144942069/Science and Technology Projects of Shenzhen