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UV-Vis. Spectroelectrochemical Study on Electron Blocking and Trapping Behaviors in Conducting Polymer Bilayers with Diphenylamine End Groups

Published online by Cambridge University Press:  31 January 2011

Yunfeng Li ,
Chin-Che Tin  and
Vince Cammarata
Yunfeng Li
Affiliation:
[email protected], Auburn University, Department of Chemistry and Biochemistry, Auburn, Alabama, United States
Chin-Che Tin
Affiliation:
[email protected], Auburn University, Department of Physics, Auburn, Alabama, United States
Vince Cammarata
Affiliation:
[email protected], Auburn University, Department of Chemistry and Biochemistry, Auburn, Alabama, United States
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Abstract

Spectroelectrochemistry was used to study the electron trapping and rectifying behavior in several diphenylamine endgroup polymeric bilayers. Various combinations of the following monomers were pairwise sequentially electropolymerized onto ITO transparent electrodes: FD, DNTD, DPTD and Cl4DPTD. Poly(FD) is a p-type material while poly(DNTD), poly(DPTD) and poly(Cl4DPTD) are bipolar materials being both n-type and p-type. Bilayers of ITO|poly(FD)|poly (DNTD) or ITO|poly (FD)|poly (DPTD), block electrons from reducing the outer layer even at -1.0 V vs Ag/AgCl, yet holes effectively oxidize both layers. The LUMO differences between poly(DNTD) and poly(Cl4DPTD) or poly(DPTD) and poly(Cl4DPTD) provide a large enough electronic barrier that electron trapping can occur between these n-type materials. The visible spectra results imply that these polymers, poly(DPTD) or poly(Cl4DPTD) can be used as photovoltaic materials.

Keywords

electrodepositionpolymerizationthin film
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1212: Symposium S – Organic Materials and Devices for Sustainable Energy Systems , 2009 , 1212-S08-23
Copyright
Copyright © Materials Research Society 2010

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