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Imaging Corrosion at the Metal-Paint Interface Using Time-of-Flight Secondary Ion Mass Spectrometry

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Energy-level alignment at strongly coupled organic-metal interfaces.

Meng-Ting Chen¹, Oliver T Hofmann, Alexander Gerlach

¹Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices and Joint International Research Laboratory of Carbon-Based Functional Materials and Devices, Soochow University, 199 Ren-Ai Road, Suzhou 215123, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|January 24, 2019

Summary

Fermi-level pinning governs energy levels in organic-metal interfaces. Thicker films of 1,2,5,6,9,10-coronenehexone (COHON) on metals yield a consistent work function, crucial for organic electronics.

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Area of Science:

Materials Science
Surface Science
Organic Electronics

Background:

Energy-level alignment at organic-metal interfaces is critical for organic electronic device performance.
Predictive models for energetics at strongly coupled interfaces are currently limited.
Understanding interface formation is key to optimizing charge injection and transport.

Purpose of the Study:

To investigate the contact formation of 1,2,5,6,9,10-coronenehexone (COHON) on coinage metal (111) surfaces.
To elucidate the role of film thickness and interfacial interactions on energy-level alignment.
To establish reliable energetics for COHON/metal interfaces.

Main Methods:

Ultraviolet photoelectron spectroscopy (UPS)
X-ray photoelectron spectroscopy (XPS)
X-ray standing wave (XSW) technique
Density functional theory (DFT) calculations

Main Results:

Work functions varied significantly for low COHON thicknesses.
Fermi-level pinning was observed for thicker COHON films.
A consistent work function of 5.2 eV was achieved for all COHON-covered metals, regardless of substrate or interaction strength.

Conclusions:

Fermi-level pinning effectively standardizes the work function in thicker COHON films on coinage metals.
This finding provides a pathway for predictable energy-level alignment in organic electronic devices.
The study offers a reliable model for energetics at strongly coupled organic-metal interfaces.