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About

The Materials Science Institute of Madrid (ICMM) is a research centre of the Spanish National Research Council (CSIC) that belongs to the area Materia.

 

Our mission is to generate new fundamental and applied knowledge on materials and processes with added value, and their transfer to the productive sectors at the local, national and European scales. We are involved in the training of new professionals on materials research, and in the dissemination of the scientific knowledge.

 

We embrace diversity, and we defend inclusive science as the only possible one.

 

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ICMM Congress

Forthcoming Events

JUN17/12:00

NanoSQUID magnetometry of multishaped individual nanoparticles
María José Martínez-Pérez  read more

JUN24/12:00

Scattering and thermalization: wave-particle duality hits quantum thermodynamics


Juan MR Parrondo   read more

Exciton-Trion Conversion Dynamics in a Single Molecule

Doležal J., Canola S., Merino P., Švec M.



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.

ACS Nano

Temporal anticorrelation of the exciton and trion and simulation. (a) Bias voltage is harmonically modulated across the trion threshold at 200 MHz, VDC = −2.4 V and VAC = 250 mV, It = 70 pA. (b) RF-PS waves recorded for the neutral exciton (red) and trion (purple). Dark counts have been subtracted from the experimental waves. (c) Rates of the time-dependent transitions used in the simulation. (d) Simulated RF-PS waves for the neutral exciton (red) and trion (purple). (e) Scheme of the 4-state model with transitions used for simulation of the exciton-trion dynamics in the ZnPc molecule in (D).

ICMM-2021 - Sor Juana Inés de la Cruz, 3, Cantoblanco, 28049 Madrid, Spain. Tel: +34 91 334 9000. info @ icmm.csic.es