Dipole-induced conductivity enhancement by n-type inclusion in a p-type system: α-Fe2O3-PEDOT:PSS nanocomposites

被引：4

作者：

Raccis, R. ^{[1
]}

Wortmann, L. ^{[1
]}

Ilyas, S. ^{[1
]}

Schlaefer, J. ^{[1
]}

Mettenboerger, A. ^{[1
]}

Mathur, S. ^{[1
]}

机构：

[1] Univ Cologne, Inst Inorgan Chem, D-50939 Cologne, Germany

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2014年 / 16卷 / 29期

关键词：

CONJUGATED POLYMERS; THIN-FILMS; NANOPARTICLES; DESIGN; CELLS; CVD;

D O I：

10.1039/c4cp01093k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：15597 / 15607

页数：11

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