Abstract
Heterostructuring of different transition metal dichalcogenides (TMDs) leads to interesting band alignment and performance improvement, and thus enables new routes for the development of materials for next-generation semiconductor electronics. Herein, we introduce a new strategy for the design and synthesis of functional TMD heterostructures. The representative product, molybdenum disulfide-capped copper sulfide (CuxS@MoS2, 1.8 < x < 2.0), is typically obtained by chemical vapor deposition of cap-like MoS2 layers on CuxS nanocrystals, yielding the formation of a sharp, clean heterojunction interface. The heterostructures exhibit strong light-matter interactions over a broadband range, with interesting band alignment for separating photocarriers and mediating charge transfer. A phototransistor made from CuxS@MoS2 heterostructures shows particularly high photoresponse for near infrared light, which is enabled by the heterojunction of MoS2 with a small band gap semiconductor as well as the plasmonic enhancement from the CuxS nanocrystals. Our study paves a way for the development of new TMD heterostructures towards achieving functional electronics and optoelectronics.
Original language | English (US) |
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Pages (from-to) | 587-594 |
Number of pages | 8 |
Journal | Materials Horizons |
Volume | 6 |
Issue number | 3 |
DOIs | |
State | Published - Mar 2019 |
Funding
This material is based on the work supported by the National Science Foundation (NSF) under Grant No. DMR-1507810. This work made use of the EPIC, Keck-II, and SPID facilities of Northwestern University’s NUANCE Center, which received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205); the MRSEC program (NSF DMR-1720139) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN. J. G. D. gratefully acknowledges support from the National Science Foundation Graduate Research Fellowship Program (NSF-GRFP). A. A. M. gratefully acknowledges support from the Ryan Fellowship and the International Institute for Nanotechnology at Northwestern University.
ASJC Scopus subject areas
- General Materials Science
- Mechanics of Materials
- Process Chemistry and Technology
- Electrical and Electronic Engineering