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Investigating dynamics of excitons in monolayer WSe2 before and after organic super acid treatment

Abstract

Due to the large photoluminescence quantum yield, high mobility and good stability, organic super acid treated two-dimensional WSe2 has drown much attention. However, reports about the influence of organic super acid treatment on dynamic processes of excitons of monolayer WSe2 are still rare. In this work, through broadband transient absorption spectra measured by femtosecond pump-probe system, we determine the dynamics of the A’ and C excitons in monolayer and bulk WSe2 at room temperature. Besides, we also observe the relaxation process of the holes between the two spin split states in valence band maximum in organic super acid treated monolayer WSe2. We find that the organic super acid treatment on monolayer WSe2 does not change the peak positions of exciton states, while those bleaching peaks’ intensities increase significantly due to the enhancement of oscillator strength for exciton states, corresponding to stronger steady-state photoluminescence. This could be attributed to the strain release induced by the defect repairing effect during the organic super acid treatment process.

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Publication details

The article was received on 27 Jan 2018, accepted on 16 Apr 2018 and first published on 16 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR00774H
Citation: Nanoscale, 2018, Accepted Manuscript
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    Investigating dynamics of excitons in monolayer WSe2 before and after organic super acid treatment

    X. Chen, Z. Wang, L. Wang, H. Wang, Y. Yue, H. Wang, X. Wang, A. T.S. Wee, C. W. Qiu and H. Sun, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR00774H

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