Discipline: Nanoscience
Subcategory: Materials Science
Session: 3
Room: Park Tower 8216
Lauren E. Kerstetter - The Pennsylvania State University
Co-Author(s): Natalya Sheremetyeva, Rensselaer Polytechnic Institute, Troy, New York; Drake Niedzielski, Rensselaer Polytechnic Institute, Troy, New York; Ama D. Agyapong, The Pennsylvania State University, State College, Pennsylvania; Anna C. Domask, The Pennsylvania State University, State College, Pennsylvania; Vincent Meunier, Rensselaer Polytechnic Institute, Troy, New York; and Suzanne E. Mohney, The Pennsylvania State University, State College, Pennsylvania
Silver atoms have been shown to diffuse into MoS2 and decrease contact resistance, which is a necessary development for future applications of layered chalcogenide materials for nanoscale electronics. We hypothesize that Raman spectroscopy can be used as a non-destructive technique to detect metal diffusion into MoS2. Using density functional theory, we predicted a significant redshift of the low-frequency interlayer Raman active modes of MoS2 with intercalated Ag, and now we have observed such a shift in Raman spectra from few-layer flakes of MoS2. The flakes were exfoliated from a bulk crystal into which evaporated silver atoms had been diffused. These results provide experimental validation of first principles calculations, and demonstrate the potential of Raman spectroscopy for non-destructive evaluation of annealed contacts to MoS2 and other layered chalcogenides.
Funder Acknowledgement(s): This work was supported by the National Science Foundation through a Research Experience and Mentoring supplement to EFRI 2-DARE grant number 1433378
Faculty Advisor: Dr. Suzanne Mohney, sem2@psu.edu
Role: Exfoliation of few-layer flakes from bulk molybdenum disulfide crystal; Raman spectroscopy data collection and analysis