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Monolayer Contact Doping of Silicon Surfaces and Nanowires Using Organophosphorus Compounds

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Resonance and localization effects at a dipolar organic semiconductor interface.

Mary P Steele¹, Leah L Kelly, Nahid Ilyas

¹Department of Chemistry, The University of Arizona, 1306 E. University Blvd., Tucson, Arizona 85721, USA.

The Journal of Chemical Physics

|October 7, 2011

Summary

This summary is machine-generated.

Investigating vanadyl naphthalocyanine (VONc) on graphite reveals charge-transfer interactions. Molecular coverage influences electronic states, creating hybrid states and affecting charge localization at the interface.

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Area of Science:

Surface science
Organic electronics
Spectroscopy

Background:

Organic semiconductors like vanadyl naphthalocyanine (VONc) are crucial for electronic devices.
Understanding interfacial electronic states is key to controlling charge transport.

Purpose of the Study:

To investigate the electronic states of VONc on highly oriented pyrolytic graphite.
To elucidate the role of interfacial charge-transfer and molecular coverage on these states.

Main Methods:

Angle-resolved two-photon photoemission (AR-TPPE) spectroscopy was employed.
Studies were conducted across 0-1 monolayer coverages of VONc.

Main Results:

Interfacial charge-transfer populates a VONc anion level, exhibiting distinct momentum dispersion.
Depolarization by neighboring molecules stabilizes this anion level with increasing coverage.
A hybrid image potential/anion state emerges near one monolayer, localizing progressively.

Conclusions:

Different charge-transfer interactions govern the electronic states at the VONc/graphite interface.
Molecular coverage significantly modifies the electronic structure and charge localization.