Fig. 10. Repair of 2D TMDs: healing and passivation. Healing: (a) schematic representation of atmospheric oxygen atoms getting adsorbed on a MoS2 monolayer. (b) STM image of O atoms (bright spots) absorbed at SV (dark triangles) sites. Inset: simulated STM image. (c) STM images of MoS2 before and after H2S healing at 200 °C. (d) Schematic illustration for post-selenization repair of SeV in MoSe2. (e) Transfer curves of high SeV (∼20%) (top) and healed SeV (∼9%) (bottom) samples. (f) Illustration of reaction pathways for repairing SV-MoS2 using 3-MPS organic molecules. (g and h) Electrical conductance (σ) as a function of gate voltage, carrier mobility and measurement temperature of exfoliated (black), single side treated (blue) and double side treated (red) samples. (i) PL spectra of exfoliated MoS2 (blue) and TFSI-treated MoS2 (red). The inset shows the 190× magnified PL spectra of as-exfoliated MoS2. (j) Confocal PL mapping image of exfoliated MoS2 (top) and TFSI-treated MoS2 (bottom). Passivation: (k) schematic of SeV passivation with Br in MoSe2 by HBr treatment and the corresponding atomic structures. (l–n) LDOS of (l) pristine MoS2 (top), (m) SV-MoS2 (middle), and (n) O-MoS2 (bottom). (o) PL spectra of SE-MoS2, SM-MoS2, and O-MoS2 grown under oxygen conditions (O-MoS2), sulfur-mild conditions (SM-MoS2) and sulfur-excess conditions (SE-MoS2), respectively. (a–c) Adapted with permission.173 Copyright 2018, Springer Nature Limited. (d and e) Adapted with permission.174 Copyright 2016, American Chemical Society. (f–h) Adapted with permission.177 Copyright 2014, Springer Nature Limited. (i and j) Adapted with permission.180 Copyright 2015, American Association for the Advancement of Science. (k) Adapted with permission.182 Copyright 2016, American Chemical Society. (l–o) Adapted with permission.186 Copyright 2022, Springer Nature Limited.
