Issue 16, 2015

Morphology and local electrical properties of PTB7:PC71BM blends


The power conversion efficiency of single layer organic solar cells can approach 10% with blends such as the polymer PTB7 and the fullerene derivative PC71BM. Here the detailed structure of PTB7:PC71BM blends deposited with and without addition of diiodooctane is studied by transmission electron microscopy and scanning probe microscopy. The details of bulk structure, such as the thickness of the layer covering fullerene domains and the grain structure of the film are examined. We find that fullerene-rich domains can be near the surface of the film or buried deeper, near the substrate. The local electrical properties of these blends are studied by conductive atomic force microscopy for different configurations of electrodes. Different power conversion efficiencies of blends with and without diiodooctane are explained in terms of local photoconductive properties.

Graphical abstract: Morphology and local electrical properties of PTB7:PC71BM blends

Supplementary files

Article information

Article type
13 Feb 2015
12 Mar 2015
First published
12 Mar 2015
This article is Open Access
Creative Commons BY license

J. Mater. Chem. A, 2015,3, 8706-8714

Morphology and local electrical properties of PTB7:PC71BM blends

A. Alekseev, G. J. Hedley, A. Al-Afeef, O. A. Ageev and I. D. W. Samuel, J. Mater. Chem. A, 2015, 3, 8706 DOI: 10.1039/C5TA01224D

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