Raccis, R., Wortmann, L., Ilyas, S., Schlaefer, J., Mettenboerger, A. and Mathur, S. (2014). Dipole-induced conductivity enhancement by n-type inclusion in a p-type system: alpha-Fe2O3-PEDOT:PSS nanocomposites. Phys. Chem. Chem. Phys., 16 (29). S. 15597 - 15608. CAMBRIDGE: ROYAL SOC CHEMISTRY. ISSN 1463-9084

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Abstract

Hematite (alpha-Fe2O3) nanoparticles of two different shapes but of same size (ca. 40 nm) were dispersed in PEDOT:PSS matrices in various concentration ranges (0-7 wt%) to study the consequent changes in conductivity in the dark and under solar illumination conditions. Within a distinct range of concentration, a distinct increase in the conductivity was observed for both spherical and cubical particle population. We ascribed this effect to the generalized Poole-Frenkel theory of conduction in conjunction with the basic depletion width properties of heterojunctions and electrostatic dipole moments, and verified our assumptions through data fitting. A difference in conductivity between sphere-and cube-based alpha-Fe2O3-PEDOT: PSS nanocomposites was also observed and ascribed to the electrostatic edge effect on the nanoparticles. The dispersion of alpha-Fe2O3 nanocrystals was confirmed by high-resolution electron microscopy, whereas the electrical properties and modulations thereof were followed by recording current-voltage characteristics.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Raccis, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wortmann, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ilyas, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schlaefer, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mettenboerger, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mathur, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-449992
DOI: 10.1039/c4cp01093k
Journal or Publication Title: Phys. Chem. Chem. Phys.
Volume: 16
Number: 29
Page Range: S. 15597 - 15608
Date: 2014
Publisher: ROYAL SOC CHEMISTRY
Place of Publication: CAMBRIDGE
ISSN: 1463-9084
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
CONJUGATED POLYMERS; THIN-FILMS; NANOPARTICLES; DESIGN; CELLS; CVDMultiple languages
Chemistry, Physical; Physics, Atomic, Molecular & ChemicalMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/44999

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