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Triggered integer charge transfer: energy-level alignment at an organic-2D material interface.

Maximilian Schaal¹, Anu Baby^2,3, Marco Gruenewald¹

¹Institute of Solid State Physics, Friedrich Schiller University Jena Helmholtzweg 5 07743 Jena Germany torsten.fritz@uni-jena.de.

Nanoscale Advances

|August 15, 2024

Summary

This summary is machine-generated.

Hexagonal boron nitride (h-BN) on Ni(111) enables single integer charge transfer in organic molecules, forming unique organic ions. This study reveals ordered organic radical anions and neutral molecules, highlighting h-BN/Ni(111) as a substrate for anion studies.

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Area of Science:

Surface Science
Organic Electronics
Materials Chemistry

Background:

Weakly interacting systems, like organic molecules on hexagonal boron nitride (h-BN), can undergo single integer charge transfer.
This charge transfer results in the formation of organic ions with distinct optical and electronic properties compared to neutral molecules.

Purpose of the Study:

To investigate the charge transfer of perylene-3,4,9,10-tetracarboxylic dianhydride (PTCDA) molecules on a hexagonal boron nitride/Ni(111) substrate.
To explore the formation of organic ions and their properties using a combined experimental and theoretical approach.

Main Methods:

Differential reflectance spectroscopy (DRS)
Scanning tunneling spectroscopy (STS)
Photoelectron orbital tomography (POT)
Density functional theory (DFT) calculations

Main Results:

A monolayer of PTCDA on h-BN/Ni(111) was found to consist of highly ordered organic radical anions and neutral molecules.
Evidence for integer charge transfer was established through energy-level alignment analysis.
The study demonstrates the formation of stable organic anions on the h-BN/Ni(111) surface.

Conclusions:

The h-BN/Ni(111) surface facilitates single integer charge transfer in organic molecules like PTCDA.
This substrate is a promising platform for investigating the unique optical and electronic properties of highly ordered organic anions.
The findings open avenues for designing novel organic electronic devices based on molecular anions.