期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 17, 页码 15044-15051出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b01947
关键词
2D materials; Transition-metal dichalcogenides; plasmonics; absorption enhancement; WS2
资金
- Materials Research Science and Engineering Center (NSF-MRSEC) of Northwestern University [DMR-1121262]
- AFOSR [FA9550-12-1-0280]
- Institute for Sustainability and Energy at Northwestern (ISEN) through ISEN Booster Award
- Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource [NSF NNCI-1542205]
- MRSEC program at the Materials Research Center [NSF DMR-1121262]
- International Institute for Nanotechnology (IIN)
- Keck Foundation
- State of Illinois, through the IIN
- Department of Defense (DoD) through the National Defense Science and Engineering Fellowship (NDSEG) Program
- Ryan Fellowship
- Northwestern University International Institute for Nanotechnology
Transition metal dichalcogenide semiconductors hold great promise in photonic and optoelectronic applications, such as flexible solar cells and ultrafast photodetectors, because of their direct band gap and few-atom thicknesses. However, it is crucial to understand and improve the absorption characteristics of these monolayer semiconducting materials. In this study, we conducted a systematic numerical and experimental investigation to demonstrate and quantify absorption enhancement in WS2 monolayer films, in the presence of silver plasmonic nanodisk arrays. Our analysis combining full-field electromagnetic simulations and optical absorption spectroscopy measurements indicates a fourfold enhancement in the absorption of an WS2 film near its band edge, close to the plasmonic resonance wavelength of Ag nanodisk arrays. The proposed Ag/WS2 heterostructure exhibited a 2.5-fold enhancement in calculated short-circuit current. Such hybrid plasmonic or two-dimensional (2D) materials with enhanced absorption pave the way for the practical realization of 2D optoelectronic devices, including ultrafast photodetectors and solar cells.
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