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KRAJŇÁK, T. STARÁ, V. PROCHÁZKA, P. PLANER, J. SKÁLA, T. BLATNIK, M. ČECHAL, J.
Originální název
Robust Dipolar Layers between Organic Semiconductors and Silver for Energy-Level Alignment
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
angličtina
Originální abstrakt
The interface between a metal electrode and an organic semiconductor (OS) layer has a defining role in the properties of the resulting device. To obtain the desired performance, interlayers are introduced to modify the adhesion and growth of OS and enhance the efficiency of charge transport through the interface. However, the employed interlayers face common challenges, including a lack of electric dipoles to tune the mutual position of energy levels, being too thick for efficient electronic transport, or being prone to intermixing with subsequently deposited OS layers. Here, we show that monolayers of 1,3,5-tris(4-carboxyphenyl)benzene (BTB) with fully deprotonated carboxyl groups on silver substrates form a compact layer resistant to intermixing while capable of mediating energy-level alignment and showing a large insensitivity to substrate termination. Employing a combination of surface-sensitive techniques, i.e., low-energy electron microscopy and diffraction, X-ray photoelectron spectroscopy, and scanning tunneling microscopy, we have comprehensively characterized the compact layer and proven its robustness against mixing with the subsequently deposited organic semiconductor layer. Density functional theory calculations show that the robustness arises from a strong interaction of carboxylate groups with the Ag surface, and thus, the BTB in the first layer is energetically favored. Synchrotron radiation photoelectron spectroscopy shows that this layer displays considerable electrical dipoles that can be utilized for work function engineering and electronic alignment of molecular frontier orbitals with respect to the substrate Fermi level. Our work thus provides a widely applicable molecular interlayer and general insights necessary for engineering of charge injection layers for efficient organic electronics.
Klíčová slova
charge injection layers; self-assembly; surfaces; photoelectron spectroscopy; energy levels; low-energy electron microscopy; scanning tunneling microscopy
Autoři
KRAJŇÁK, T.; STARÁ, V.; PROCHÁZKA, P.; PLANER, J.; SKÁLA, T.; BLATNIK, M.; ČECHAL, J.
Vydáno
29. 3. 2024
Nakladatel
American Chemical Society
Místo
WASHINGTON
ISSN
1944-8252
Periodikum
ACS applied materials & interfaces
Ročník
16
Číslo
14
Stát
Spojené státy americké
Strany od
18099
Strany do
18111
Strany počet
13
URL
https://pubs.acs.org/doi/10.1021/acsami.3c18697
Plný text v Digitální knihovně
http://hdl.handle.net/11012/245522
BibTex
@article{BUT188450, author="Tomáš {Krajňák} and Veronika {Stará} and Pavel {Procházka} and Jakub {Planer} and Tomáš {Skála} and Matthias {Blatnik} and Jan {Čechal}", title="Robust Dipolar Layers between Organic Semiconductors and Silver for Energy-Level Alignment", journal="ACS applied materials & interfaces", year="2024", volume="16", number="14", pages="18099--18111", doi="10.1021/acsami.3c18697", issn="1944-8252", url="https://pubs.acs.org/doi/10.1021/acsami.3c18697" }