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One‐Step Solution Phase Growth of Transition Metal Dichalcogenide Thin Films Directly on Solid Substrates
Author(s) -
Giri Anupam,
Yang Heeseung,
Thiyagarajan Kalianan,
Jang Woosun,
Myoung Jae Min,
Singh Ranbir,
Soon Aloysius,
Cho Kilwon,
Jeong Unyong
Publication year - 2017
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201700291
Subject(s) - thin film , materials science , electrolyte , transition metal , phase (matter) , chemical engineering , nanotechnology , optoelectronics , absorption (acoustics) , catalysis , electrode , organic chemistry , composite material , chemistry , engineering
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 (MoS 2 , WS 2 , MoSe 2 , WSe 2 , 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 MoS 2 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.