Journal
ADVANCED MATERIALS
Volume 29, Issue 26, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201700291
Keywords
photodetectors; solution-phase synthesis; transition metal dichalcogenides; thin films
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Funding
- National Research Foundation of Korea (NRF) - Korean Government (MSIP) [NRF-2015R1A2A1A10054164]
- Center for Advanced Soft Electronics
- Ministry of Education, Science and Technology [CASE-2015M3A6A5072945]
- National Research Foundation of Korea [2015R1A2A1A10054164, 2011-0031628] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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 mu s). This study paves a robust way for the synthesis of various TMD thin films in solution phases.
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