Kaiser, Katharina and Lieske, Leonard-Alexander and Repp, Jascha and Gross, Leo (2023) Charge-state lifetimes of single molecules on few monolayers of NaCl. NATURE COMMUNICATIONS, 14 (1): 4988. ISSN , 2041-1723
Full text not available from this repository. (Request a copy)Abstract
In molecular tunnel junctions, where the molecule is decoupled from the electrodes by few-monolayers-thin insulating layers, resonant charge transport takes place by sequential charge transfer to and from the molecule which implies transient charging of the molecule. The corresponding charge state transitions, which involve tunneling through the insulating decoupling layers, are crucial for understanding electrically driven processes such as electroluminescence or photocurrent generation in such a geometry. Here, we use scanning tunneling microscopy to investigate the decharging of single ZnPc and H2Pc molecules through NaCl films of 3 to 5 monolayers thickness on Cu(111) and Au(111). To this end, we approach the tip to the molecule at resonant tunnel conditions up to a regime where charge transport is limited by tunneling through the NaCl film. The resulting saturation of the tunnel current is a direct measure of the lifetimes of the anionic and cationic states, i.e., the molecule's charge-state lifetime, and thus provides a means to study charge dynamics and, thereby, exciton dynamics. Comparison of anion and cation lifetimes on different substrates reveals the critical role of the level alignment with the insulator's conduction and valence band, and the metal-insulator interface state. Resonant charge transport to and from molecules and their corresponding charge-state transitions are critical to understanding electrically driven processes. Here, the authors investigate the charge-state lifetimes of single molecules through NaCl films of 3 to 5 monolayers thickness.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DYNAMICS; PHOTOEMISSION; SPECTROSCOPY; EMISSION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Giessibl > Group Jascha Repp |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Mar 2024 13:59 |
| Last Modified: | 16 Mar 2024 13:59 |
| URI: | https://pred.uni-regensburg.de/id/eprint/60209 |
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