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Exciton-trion conversion dynamics in a single molecule

SYSNO ASEP	0543096
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Exciton-trion conversion dynamics in a single molecule
Author(s)	Doležal, Jiří (FZU-D)_{ORCID, RID} Canola, Sofia (FZU-D)_ORCID Merino, P. (ES) Švec, Martin (FZU-D)_{RID, ORCID}
Number of authors	4
Source Title	ACS Nano. - : American Chemical Society - ISSN 1936-0851 Roč. 15, č. 4 (2021), s. 7694-7699
Number of pages	6 s.
Language	eng - English
Country	US - United States
Keywords	STML ; phase fluorometry ; exciton ; trion ; lifetime ; zinc phthalocyanine ; photon map
Subject RIV	BM - Solid Matter Physics ; Magnetism
OECD category	Optics (including laser optics and quantum optics)
R&D Projects	GA20-18741S GA ČR - Czech Science Foundation (CSF)
Method of publishing	Limited access
Institutional support	FZU-D - RVO:68378271
UT WOS	000645436800152
EID SCOPUS	85104916129
DOI	10.1021/acsnano.1c01318
Annotation	Charged optical excitations (trions) generated by charge carrier injection are crucial for emerging optoelectronic technologies as they can be produced and manipulated by electric fields. Trions and neutral excitons can be efficiently induced in single molecules by means of tip-enhanced spectromicroscopic techniques. However, little is known of the exciton-trion dynamics at single molecule level as this requires methods permitting simultaneous subnanometer and subnanosecond characterization. Here, we investigate exciton-trion dynamics by phase fluorometry, combining radio frequency modulated scanning tunnelling luminescence with time-resolved single photon detection. We generate excitons and trions in single Zinc Phthalocyanine (ZnPc) molecules on NaCl/Ag(111), and trace the evolution of the system in the picosecond range. We explore the dependence of effective lifetimes on bias voltage and describe the conversion mechanism from neutral excitons to trions, via charge capture, as the primary pathway to trion formation. We corroborate the dynamics of the system by a causally deterministic four-state model.
Workplace	Institute of Physics
Contact	Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579
Year of Publishing	2022
Electronic address	https://doi.org/10.1021/acsnano.1c01318

Number of the records: 1