SurfaceScience21 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 89: Poster Session VII: Organic molecules on inorganic substrates: electronic, optical and other properties III
O 89.3: Poster
Donnerstag, 4. März 2021, 10:30–12:30, P
Exciton-trion dynamics of a single molecule probed by Radio-frequency STM-induced luminescence — •Jiří Doležal1,2, Sofia Canola1, Pablo Merino3,4, and Martin Švec1,5 — 1Institute of Physics, Czech Academy of Sciences, Cukrovarnická 10/112, CZ16200 Praha 6, Czech Republic — 2Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, CZ12116 Praha 2, Czech Republic — 3Instituto de Ciencia de Materiales de Madrid, CSIC, Sor Juana Inés de la Cruz 3, E28049 Madrid, Spain — 4Instituto de Física Fundamental, CSIC, Serrano 121, E28006 Madrid, Spain — 5Regional Centre of Advanced Technologies and Materials, Šlechtitelů 27, CZ78371 Olomouc, Czech Republic
Combination of radio-frequency (RF) modulated bias and photon detection overcomes the microsecond time resolution limit of transimpedance amplifiers in conventional STM. Here, we report two novel tip-enhanced optical methods: for calibration of RF transmission by detecting the energy of the plasmon edge and for measuring time evolution of fluorescent systems by phase shift of the RF signal. The RF phase-shift method corrected for amplitude transmission is applied to Zinc Phthalocyanine (ZnPc) molecules on NaCl/Ag(111). We generate excitons and trions in ZnPc, determine their dynamics and trace the evolution of the system in the picosecond range. In addition, we explore dependence of effective lifetimes on bias voltage, propose a conversion mechanism from neutral excitons to trions via charge capture and perform a stochastic simulation to corroborate the experimental results.