期刊
NANO LETTERS
卷 18, 期 4, 页码 2316-2323出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b05060
关键词
Transition metal dichalcogenide; silver nanowire network; surface plasmon; strain relaxation; plasmon induced photocurrent; photogain effect
类别
资金
- Institute for Basic Science [IBS-R011-D1]
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2016R1A2B2015581]
- National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2016R1A6A3A11936024]
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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