Properties of individual dopant atoms in single-layer MoS2: atomic structure, migration, and enhanced reactivity.

Lin, Yung-Chang; Dumcenco, Dumitru O; Komsa, Hannu-Pekka; Niimi, Yoshiko; Krasheninnikov, Arkady V; Huang, Ying-Sheng; Suenaga, Kazu · Adv Mater · 2014

basic_science · Level V

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Abstract

Single-layered MoS2 doped with Re (n-type) and Au (p-type) are investigated by in situ scanning transmission electron microscopy. Re atoms substituting Mo sites enhance the local chemical affinity, evidenced by agglomeration of other dopant/impurity atoms. Au atoms exist as adatoms and show larger mobility under the electron beam. These behaviors are consistent with density functional theory calculations.