Dr. Jaroslav Vacek
+420 220 183 103
Selected papers
Mechanical tuning of conductance and thermopower in helicene molecular junctions
Nanoscale 7 (19): 8793-8802 (2015)
Helicenes are inherently chiral polyaromatic molecules composed of all-ortho fused benzene rings possessing a spring-like structure. Here, using a combination of density functional theory and tight-binding calculations, it is demonstrated that controlling the length of the helicene molecule by mechanically stretching or compressing the molecular junction can dramatically change the electronic properties of the helicene, leading to a tunable switching behavior of the conductance and thermopower of the junction with on/off ratios of several orders of magnitude. Furthermore, control over the helicene length and number of rings is shown to lead to more than an order of magnitude increase in the thermopower and thermoelectric figure-of-merit over typical molecular junctions, presenting new possibilities of making efficient thermoelectric molecular devices. The physical origin of the strong dependence of the transport properties of the junction is investigated, and found to be related to a…
Latest publications
The Stability of Hydrogen-Bonded Ion-Pair Complex Unexpectedly Increases with Increasing Solvent Polarity
Angewandte Chemie International Edition 2024: Early View
Racemic dimers as models of chiral macrocycles self-assembled on pyrolytic graphite
Carbon Trends 12: 100284 (2023)
Helicene-based π-conjugated macrocycles: their synthesis, properties, chirality and self-assembly into molecular stripes on a graphite surface
Nanoscale 15 (4): 1542–1553 (2023)
Push–pull amino-nitro helicenes: synthesis, (chir)optical properties and self-assembly into thin films
Chemical Communications 58 (91): 12732–12735 (2022)