Mr. Edward Jung Profile

Edward Jung

at California State Univ., Northridge

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Proceedings Article | 4 March 2022 Presentation + Paper

Dynamics of exciton formation, recombination, and trapping in monolayers of 2D-TMD materials

Joie Yuson, Dillon Contreras, Marina Achterman, Edward Jung, Abdelaziz Boulesbaa

Proceedings Volume 11990, 1199005 (2022) https://doi.org/10.1117/12.2630804

KEYWORDS: Carrier dynamics, Excitons, Picosecond phenomena, Absorption, Crystals, Electrons, Tungsten, Femtosecond phenomena

Read Abstract +

The optical and electrical properties of two-dimensional transition metal dichalcogenide materials (2D-TMDs) are determined by their exciton dynamics. When the thickness of these materials is thinned down to a single layer, the spatial confinement makes the impact of exciton dynamics on the functionality of 2D-TMD-based devices even more important. Here, we present an investigation of the dynamics of formation and decay of the lowest excitons 2D-TMD monolayers. Excitation energy-dependent transient absorption studies indicated that the exciton formation time increases linearly from ~150 fs upon resonant excitation to ~500 fs following excitation that is ~1.1 eV above the bandgap. This dependence is attributed to the time it takes highly excited electrons in the conduction band (CB) to relax to the CB minimum (CBM) and contribute to the formation of the X_A exciton. Additionally, excitation energy dependent studies suggested that the exciton average lifetime increases from ~10 ps in the case of resonant excitation to ~50 ps following excitation well above the band-gap. Furthermore, studies of the dependence of exciton dynamics on the excitation density suggested that exciton decay in these materials is dominated by defect-assisted recombination (DAR).

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