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Issue 21, 2015
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Spatiotemporal dynamics of excitons in monolayer and bulk WS2

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Abstract

Spatiotemporal dynamics of excitons in monolayer and bulk WS2 at room temperature is studied by transient absorption microscopy in the reflection geometry. Excitons are formed from photocarriers injected by a tightly focused 390 nm pump pulse, and monitored by detecting different reflection of a time-delayed and spatially scanned 620 nm probe pulse. We obtain exciton lifetimes of 22 ± 1 and 110 ± 10 ps in monolayer and bulk WS2, respectively. Both lifetimes are independent of the exciton density, showing the absence of multi-exciton recombination processes. Exciton diffusion coefficients of 60 ± 20 and 3.5 ± 0.5 cm2 s−1 are obtained in monolayer and bulk samples, respectively. These results provide a foundation for understanding excitons in this new material and its optoelectronic applications.

Graphical abstract: Spatiotemporal dynamics of excitons in monolayer and bulk WS2

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Publication details

The article was received on 10 Jan 2015, accepted on 16 Apr 2015 and first published on 27 Apr 2015


Article type: Paper
DOI: 10.1039/C5NR00188A
Citation: Nanoscale, 2015,7, 9526-9531
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    Spatiotemporal dynamics of excitons in monolayer and bulk WS2

    J. He, D. He, Y. Wang, Q. Cui, F. Ceballos and H. Zhao, Nanoscale, 2015, 7, 9526
    DOI: 10.1039/C5NR00188A

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