Augmented Quantum Yield of a 2D Monolayer Photodetector by Surface Plasmon Coupling
- Authors
- Bang, Seungho; Duong, Ngoc Thanh; Lee, Jubok; Cho, Yoo Hyun; Oh, Hye Min; Kim, Hyun; Yun, Seok Joon; Park, Chulho; Kwon, Min-Ki; Kim, Ja-Yeon; Kim, Jeongyong; Jeong, Mun Seok
- Issue Date
- Apr-2018
- Publisher
- AMER CHEMICAL SOC
- Keywords
- Transition metal dichalcogenide; silver nanowire network; surface plasmon; strain relaxation; plasmon induced photocurrent; photogain effect
- Citation
- NANO LETTERS, v.18, no.4, pp.2316 - 2323
- Indexed
- SCIE
SCOPUS
- Journal Title
- NANO LETTERS
- Volume
- 18
- Number
- 4
- Start Page
- 2316
- End Page
- 2323
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/150195
- DOI
- 10.1021/acs.nanolett.7b05060
- ISSN
- 1530-6984
- 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.
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