Abstract
Nanoscale transition-metal dichalcogenide (TMDC) materials, such as MoS2, exhibit promising behavior in next-generation electronics and energy-storage devices. TMDCs have a highly anisotropic crystal structure, with edge sites and basal planes exhibiting different structural, chemical, and electronic properties. In virtually all applications, two-dimensional or bulk TMDCs must be interfaced with other materials (such as electrical contacts in a transistor). The presence of edge sites vs basal planes (i.e., the crystallographic orientation of the TMDC) could influence the chemical and electronic properties of these solid-state interfaces, but such effects are not well understood. Here, we use in situ X-ray photoelectron spectroscopy (XPS) to investigate how the crystallography and structure of MoS2 influence chemical transformations at solid-state interfaces with various other materials. MoS2 materials with controllably aligned crystal structures (horizontal vs vertical orientation of basal planes) were fabricated, and in situ XPS was carried out by sputter-depositing three different materials (Li, Ge, and Ag) onto MoS2 within an XPS instrument while periodically collecting photoelectron spectra; these deposited materials are of interest due to their application in electronic devices or energy storage. The results showed that Li reacts readily with both crystallographic orientations of MoS2 to form metallic Mo and Li2S, while Ag showed very little chemical or electronic interaction with either type of MoS2. In contrast, Ge showed significant chemical interactions with MoS2 basal planes, but only minor chemical changes were observed when Ge contacted MoS2 edge sites. These findings have implications for electronic transport and band alignment at these interfaces, which is of significant interest for a variety of applications.
Original language | English |
---|---|
Pages (from-to) | 32394-32404 |
Number of pages | 11 |
Journal | ACS Applied Materials and Interfaces |
Volume | 9 |
Issue number | 37 |
DOIs | |
State | Published - Sep 20 2017 |
Externally published | Yes |
Funding
The authors thank Dr. Walter Henderson and Ms. Rebhadevi Monikandan at the Institute for Electronics and Nanotechnology (IEN) at the Georgia Institute of the Technology for their assistance in developing the in situ XPS technique in this work. Assistance from Francisco Quintero Cortes in revising this manuscript is acknowledged. This work was performed in part at the Georgia Tech IEN, a member of the National Nanotechnology Coordinated Infrastructure, which is supported by the National Science Foundation (Grant ECCS-1542174). Additional support was provided by an IEN Seed Grant. Support is also acknowledged from faculty startup funds from the Georgia Institute of Technology.
Keywords
- MoS
- in situ XPS
- interfacial reactions
- phase transformations
- transition-metal dichalcogenide