Exciton dynamics in tungsten dichalcogenide monolayers
文献信息
Hongwei Liu, Junpeng Lu
The strong photoluminescence from monolayer WS2 and WSe2 paves the way for a range of optoelectronic applications and opens up the door for ultrafast carrier dynamics study. In this work, we observed that monolayer WS2 and WSe2 exhibited giant absorption in the visible frequency range. This phenomenon has been ascribed to the band nesting effect. We used time-resolved photoluminescence spectroscopy to study the absorption and recombination dynamics of the photocarriers in monolayer WS2 and WSe2. We found that some of the electron–hole pairs excited in the band nesting region initially relaxed to the K/K′ point and then underwent radiative decay. The decay and recombination of the photocarriers occurred rapidly and terminated within the sub-nanosecond timescale. The observed experimental results indicate the great potential of these materials in optoelectronic devices.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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