Exciton Coherence Length and Dynamics in Graphene Quantum Dot Assemblies

Singh, Varun; Zoric, Marija R.; Hargenrader, George N.; Valentine, Andrew S.; Zivojinovic, Olivera; Milic, Dragana R.; Li, Xiaosong; Glusac, Ksenija D.

doi:10.1021/acs.jpclett.9b03384

Title: Exciton Coherence Length and Dynamics in Graphene Quantum Dot Assemblies

Journal Article · 15 December 2019 · Journal of Physical Chemistry Letters

DOI: https://doi.org/10.1021/acs.jpclett.9b03384 · OSTI ID:1756424

Singh, Varun ^[1]; Zoric, Marija R. ^[1]; Hargenrader, George N. ^[1]; Valentine, Andrew S. ^[2]; Zivojinovic, Olivera ^[3];

^[4];

^[2];

^[1]

Univ. of Illinois, Chicago, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Univ. of Washington, Seattle, WA (United States)
Eidgenoessische Technische Hochschule, Zurich (Switzerland); Univ. of Belgrade (Serbia)
Univ. of Belgrade (Serbia)

Here, exciton size and dynamics were studied in assemblies of two well-defined graphene quantum dots of varying size: hexabenzocoronene (HBC), where the aromatic core consists of 42 C atoms, and carbon quantum dot (CQD) with 78 C atoms. The synthesis of HBC and CQD were achieved using bottom-up chemical methods, while their assembly was studied using steady-state UV/vis spectroscopy, X-ray scattering, and electron microscopy. While HBC forms long ordered fibers, CQD was found not to assemble well. The exciton size and dynamics were studied using time-resolved laser spectroscopy. At early times (~100 fs), the exciton was found to delocalize over similar to ~1–2 molecular units in both assemblies, which reflects the confined nature of excitons in carbon-based materials and is consistent with the calculated value of ~2 molecular units. Exciton-exciton annihilation measurements provided the exciton diffusion lengths of 16 and 3 nm for HBC and CQD, respectively.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1756424

Journal Information:: Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 1 Vol. 11; ISSN 1948-7185

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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