Effective Negative Diffusion of Singlet Excitons in Organic Semiconductors

Anton Matthijs Berghuis (Corresponding author), T. V. Raziman, Alexei Halpin, Shaojun Wang, Alberto G. Curto, Jaime Gómez Rivas (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

Samenvatting

Using diffraction-limited ultrafast imaging techniques, we investigate the propagation of singlet and triplet excitons in single-crystal tetracene. Instead of an expected broadening, the distribution of singlet excitons narrows on a nanosecond time scale after photoexcitation. This narrowing results in an effective negative diffusion in which singlet excitons migrate toward the high-density region, eventually leading to a singlet exciton distribution that is smaller than the laser excitation spot. Modeling the excited-state dynamics demonstrates that the origin of the anomalous diffusion is rooted in nonlinear triplet–triplet annihilation (TTA). We anticipate that this is a general phenomenon that can be used to study exciton diffusion and nonlinear TTA rates in semiconductors relevant for organic optoelectronics.
Originele taal-2Engels
Pagina's (van-tot)1360-1366
Aantal pagina's7
TijdschriftThe Journal of Physical Chemistry Letters
Volume12
Nummer van het tijdschrift4
DOI's
StatusGepubliceerd - 28 jan 2021

Bibliografische nota

PMID: 33507078

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