期刊
ACS NANO
卷 14, 期 6, 页码 7444-7453出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c03086
关键词
monolayer semiconductors; photoluminescence pumping; aggregation-induced emission (AIE); molecular rotors; transition metal dichalcogenides; organic-inorganic heterostructures
类别
资金
- Australian Renewable Energy Agency (ARENA) [RND017]
- National Science Foundation of China [51973030]
- Australian Government Research Training Program (RTP) Scholarship
- Australian Centre for Advanced Photovoltaics (ACAP)
Organic-inorganic (O-I) heterostructures, consisting of atomically thin inorganic semiconductors and organic molecules, present synergistic and enhanced optoelectronic properties with a high tunability. Here, we develop a class of air- stable vertical O-I heterostructures comprising a monolayer of transition-metal dichalcogenides (TMDs), including WS2, WSe2, and MoSe2, on top of tetraphenylethylene (TPE) core-based aggregation-induced emission (ME) molecular rotors. The created O-I heterostructures yields a photoluminescence (PL) enhancement of up to similar to 950%, similar to 500%, and similar to 330% in the top monolayer WS2, MoSe2, and WSe2 as compared to PL in their pristine monolayers, respectively. The strong PL enhancement is mainly attributed to the efficient photogenerated carrier process in the AIE luminogens (courtesy of their restricted intermolecular motions in the solid state) and the charge-transfer process in the created type I O-I heterostructures. Moreover, we observe an improvement in photovoltaic properties of the TMDs in the heterostructures including the quasi-Fermi level splitting, minority carrier lifetime, and light absorption. This work presents an inspiring example of combining stable, highly luminescent ME-based molecules, with rich photochemistry and versatile applications, with atomically thin inorganic semiconductors for multifunctional and efficient optoelectronic devices.
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