Ultrathin transition metal dichalcogenides (TMDs) have exotic electronic properties. With success in easy synthesis of high quality TMD thin films, the potential applications will become more viable in electronics, optics, energy storage, and catalysis. Synthesis of TMD thin films has been mostly performed in vacuum or by thermolysis. So far, there is no solution phase synthesis to produce large-area thin films directly on target substrates. Here, this paper reports a one-step quick synthesis (within 45–90 s) of TMD thin films (MoS2, WS2, MoSe2, WSe2, etc.) on solid substrates by using microwave irradiation on a precursor-containing electrolyte solution. The numbers of the quintuple layers of the TMD thin films are precisely controllable by varying the precursor's concentration in the electrolyte solution. A photodetector made of MoS2 thin film comprising of small size grains shows near-IR absorption, supported by the first principle calculation, exhibits a high photoresponsivity (>300 mA W−1) and a fast response (124 µs). This study paves a robust way for the synthesis of various TMD thin films in solution phases.
Bibliographical noteFunding Information:
A.G. and H.Y. contributed equally to this work. The authors are grateful for the financial support from the National Research Foundation of Korea (NRF) grant funded by the Korean Government (MSIP) under Project No. NRF-2015R1A2A1A10054164 and from the Center for Advanced Soft Electronics, funded by the Ministry of Education, Science and Technology as a ?Global Frontier Project? (CASE-2015M3A6A5072945).
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering