Augmented Quantum Yield of a 2D Monolayer Photodetector by Surface Plasmon Coupling

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Title
Augmented Quantum Yield of a 2D Monolayer Photodetector by Surface Plasmon Coupling
Author(s)
Seungho Bang; Ngoc Thanh Duong; Jubok Lee; Yoo Hyun Cho; Hye Min Oh; Hyun Kim; Seok Joon Yun; Chulho Park; Min-Ki Kwon; Ja-Yeon Kim; Jeongyong Kim; Mun Seok Jeong
Publication Date
2018-04
Journal
NANO LETTERS, v.18, no.4, pp.2316 - 2323
Publisher
AMER CHEMICAL SOC
Abstract
Monolayer (1L) transition metal dichalcogenides (TMDCs) are promising materials for nanoscale optoelectronic devices because of their direct band gap and wide absorption range (ultraviolet to infrared). However, 1L-TMDCs cannot be easily utilized for practical optoelectronic device applications (e.g., photodetectors, solar cells, and light-emitting diodes) because of their extremely low optical quantum yields (QYs). In this investigation, a high-gain 1L-MoS2 photodetector was successfully realized, based on the surface plasmon (SP) of the Ag nanowire (NW) network. Through systematic optical characterization of the hybrid structure consisting of a 1L-MoS2 and the Ag NW network, it was determined that a strong SP and strain relaxation effect influenced a greatly enhanced optical QY. The photoluminescence (PL) emission was drastically increased by a factor of 560, and the main peak was shifted to the neutral exciton of 1L-MoS2. Consequently, the overall photocurrent of the hybrid 1L-MoS2 photodetector was observed to be 250 times better than that of the pristine 1L-MoS2 photodetector. In addition, the photoresponsivity and photodetectivity of the hybrid photodetector were effectively improved by a factor of similar to 1000. This study provides a new approach for realizing highly efficient optoelectronic devices based on TMDCs © 2018 American Chemical Society
URI
https://pr.ibs.re.kr/handle/8788114/4589
ISSN
1530-6984
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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