Morphology and local electrical properties of PTB7:PC71BM blends
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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.
Alekseev , A , Hedley , G J , Al-Afeef , A , Ageev , O A & Samuel , I D W 2015 , ' Morphology and local electrical properties of PTB7:PC 71 BM blends ' Journal of Materials Chemistry A , vol 3 , no. 16 , pp. 8706-8714 . DOI: 10.1039/C5TA01224D
Journal of Materials Chemistry A
Copyright 2015 the Authors. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.1039/C5TA01224D
This work was supported by EPSRC (EP/I013288/1). I.D.W.S. was partly supported by the European Union Seventh Framework Programme under grant agreement 321305 and a Royal Society Wolfson Research Merit Award. Part of the work of A.A. and O.A was supported by Ministry of Education and Science of Russian Federation, project 14.A18.21.0887 and the Russian Government Program of Competitive Growth of Kazan Federal University. Date of Acceptance: 12/03/2015
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