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Determination of Fullerene Scattering Length Density: A Critical Parameter for Understanding the Fullerene Distribution in Bulk Heterojunction Organic Photovoltaic Devices

descriptionPublicationkeyboard_double_arrow_right Article , Journal 27 Jan 2014 United Kingdom, Australia Publisher:American Chemical Society (ACS)Journal:Langmuir, volume 30, pages 1,410-1,415 (issn: 0743-7463, eissn: 1520-5827,

Authors: Paul Meredith; Marappan Velusamy; Andrew J. Clulow; Ian R. Gentle; Kwan H. Lee; Michael James; Michael James; +5 Authors

doi: 10.1021/la403951j

pmid: 24467334

Determination of Fullerene Scattering Length Density: A Critical Parameter for Understanding the Fullerene Distribution in Bulk Heterojunction Organic Photovoltaic Devices

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Abstract

Fullerene derivatives are commonly used as electron acceptors in combination with (macro)molecular electron donors in bulk heterojunction (BHJ) organic photovoltaic (OPV) devices. Understanding the BHJ structure at different electron donor/acceptor ratios is critical to the continued improvement and development of OPVs. The high neutron scattering length densities (SLDs) of the fullerenes provide effective contrast for probing the distribution of the fullerene within the blend in a nondestructive way. However, recent neutron scattering studies on BHJ films have reported a wide range of SLDs ((3.6-4.4) × 10(-6) Å(-2)) for the fullerenes 60-PCBM and 70-PCBM, leading to differing interpretations of their distribution in thin films. In this article, we describe an approach for determining more precisely the scattering length densities of the fullerenes within a polymer matrix in order to accurately quantify their distribution within the active layers of OPV devices by neutron scattering techniques.

Countries

United Kingdom, Australia

Related Organizations

University of Queensland
Australia
Queensland University of Technology
Australia
UNSW Sydney
Australia
Australian Nuclear Science and Technology Organisation
Australia
Bragg Institute

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Keywords

Neutrons, Multidisciplinary, 3104 Condensed Matter Physics, POolymers, 2500 Materials Science, Materials Science, 1607 Spectroscopy, 1603 Electrochemistry, 3110 Surfaces and Interfaces, Binding energy, 540, 530, Chemistry, Fullerness, Heterojunctions, Physical, Films

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