Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Raccis, R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wortmann, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ilyas, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schlaefer, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mettenboerger, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Keywords Language CONJUGATED POLYMERS; THIN-FILMS; NANOPARTICLES; DESIGN; CELLS; CVD Multiple languages Chemistry, Physical; Physics, Atomic, Molecular & Chemical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44999