Berlin 2018 – scientific programme

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DS: Fachverband Dünne Schichten

DS 6: Thin Film Applications

DS 6.9: Talk

Monday, March 12, 2018, 17:15–17:30, H 0111

Growth of large sized 2D molybdenum sulfide flakes at the air-liquid interface — Xiaoling Zeng, Talha Nisar, Marlis Ortel, •Torsten Balster, and Veit Wagner — Jacobs University Bremen, Campus Ring 1, 28759 Bremen,Germany

Layered transition metal chalcogenides, especially MoS₂, are promising materials for catalysis as well as semiconducting layers in thin film transistors. Since the 1st transistors were produced with mechanically exfoliated MoS₂ flakes, new deposition processes for large area and atomically thin layers are needed to enable new generation electronic devices.
In this investigation, we have developed a cheap, wet chemical deposition process, which takes aadvantage of growth on a liquid surface. For this purpose, a saturated solution of ammonium tetrathiomolybdate (ATTM) in deionized water was prepared by heating and ultrasonication. After two hours of cooling period molybdenum sulfide flakes were formed in solution at the air-liquid interface with a lateral size of more than 150µm. These flakes were transferred onto a SiO₂/Si substrate in a Langmuir-Blodgett like deposition process. The thickness of the flakes ranged from a single monolayer to 5 monolayers as confirmed by AFM and Raman spectroscopy. XPS and TEM reveal, that with post growth thermal treatment flakes of high quality are obtained.