期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 138, 期 44, 页码 14713-14719出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b08883
关键词
-
资金
- Materials Science and Engineering Division, Office of Basic Energy Sciences, U.S. Department of Energy
Photoinduced interfacial charge transfer is at the heart of many applications, including photovoltaics, photocatalysis, and photodetection. With the emergence of a new class of semiconductors, i.e., monolayer two-dimensional transition metal dichalcogenides (2D-TMDs), charge transfer at the 2D/2D heterojunctions has attracted several efforts due to the remarkable optical and electrical properties of 2D-TMDs. Unfortunately, in 2D/2D heterojunctions, for a given combination of two materials, the relative energy band alignment and the charge-transfer efficiency are locked. Due to their large variety and broad size tunability, semiconductor quantum dots (0D-QDs) interfaced with 2D-TMDs may become an attractive heterostructure for optoelectronic applications. Here, we incorporate femtosecond pump probe spectroscopy to reveal the sub-45 fs charge transfer at a 2D/OD heterostructure composed of tungsten disulfide monolayers (2D-WS2) and a single layer of cadmium selenide/zinc sulfide core/shell 0D-QDs. Furthermore, ultrafast dynamics and steady-state measurements suggested that, following electron transfer from the 2D to the OD, hybrid excitons, wherein the electron resides in the OD and the hole resides in the 2D-TMD monolayer, are formed with a binding energy on the order of similar to 140 meV, which is several times lower than that of tightly bound excitons in 2D-TMDs.
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