Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 6: Organic molecules on inorganic substrates: Adsorption and growth I
O 6.3: Talk
Monday, March 9, 2026, 11:00–11:15, TRE/PHYS
Surface study of heteromolecular layers for charge injection: deprotonated carboxylic acids mixed with pentacene — •Jakub Planer1, Veronika Stará1, Pavel Procházka1, and Jan Čechal1,2 — 1Central European Institute of Technology, Brno University of Technology, Czech Republic — 2Institute of Physical Engineering, Brno University of Technology, Czech Republic
Heteromolecular organic films represent promising candidates for efficient charge-injection layers in organic optoelectronic devices. Using surface-science experiments together with ab-initio modeling, we investigate the structural and electronic properties of intermixed layers composed of fully deprotonated carboxylic acids and pentacene (PEN) on Ag(100) and Ag(111) substrates. Our work demonstrates that these molecules form blends capable of modulating the electrode work function by up to 0.5 eV, depending on the mixing ratio, while remaining stable during subsequent organic-semiconductor deposition. These findings underline the potential of mixed carboxylate–PEN layers as practical, robust charge-injection modifiers and show that various carboxylic acids can be effectively used in such heteromolecular interfaces [1,2].
[1] Stará, Veronika, et al. Tunable Energy-Level Alignment in Multilayers of Carboxylic Acids on Silver. Physical Review Applied, 18, (2022)
[2] Krajňák, T. et al. Robust Dipolar Layers between Organic Semiconductors and Silver for Energy-Level Alignment. ACS Appl. Mater. Interfaces, 16, (2024)
Keywords: charge injection; heteromolecular layers; ab-initio calculations; self-assembled monolayers; organic semiconductors