Enhanced Photosensitivity in Monolayer MoS2 with PbS Quantum Dots

Sangeun Cho; Yongcheol Jo; Hyeonseok Woo; Jongmin Kim; Jungwon Kwak; Hyungsang Kim; Hyunsik Im

doi:10.5757/ASCT.2017.26.3.47

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Applied Science and Convergence Technology 2017; 26(3): 47-49

Published online May 31, 2017

https://doi.org/10.5757/ASCT.2017.26.3.47

Enhanced Photosensitivity in Monolayer MoS2 with PbS Quantum Dots

Sangeun Cho^a , Yongcheol Jo^a , Hyeonseok Woo^a , Jongmin Kim^a , Jungwon Kwak^b , Hyungsang Kim^a , and Hyunsik Im^{a , *}

^aDivision of Physics & Semiconductor Science, Dongguk University, Seoul 04620, South Korea, ^bMedical Physics Department, Asan Medical Center, Seoul 05505, South Korea

Correspondence to:E-mail: hyunsik7@dongguk.edu

Received: March 28, 2017; Revised: April 27, 2017; Accepted: April 27, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Abstract

Photocurrent enhancement has been investigated in monolayer (1L) MoS₂ with PbS quantum dots (QDs). A metal-semiconductor-metal (Au-1L MoS₂-Au) junction device is fabricated using a standard photolithography method. Considerably improved photo-electrical properties are obtained by coating PbS QDs on the Au-1L MoS₂-Au device. Time dependent photoconductivity and current-voltage characteristics are investigated. For the QDs-coated MoS₂ device, it is observed that the photocurrent is considerably enhanced and the decay life time becomes longer. We propose that carriers in QDs are excited and transferred to the MoS₂ channel under light illumination, improving the photocurrent of the 1L MoS₂ channel. Our experimental findings suggest that two-dimensional layered semiconductor materials combined with QDs could be used as building blocks for highly-sensitive optoelectronic detectors including radiation sensors.

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Enhanced Photosensitivity in Monolayer MoS2 with PbS Quantum Dots

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