Paterno, GM;
Stewart, JR;
Wildes, A;
Cacialli, F;
Sakai, VG;
(2016)
Neutron polarisation analysis of Polymer: Fullerene blends for organic photovoltaics.
Polymer
, 105
pp. 407-413.
10.1016/j.polymer.2016.07.079.
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Abstract
The photogeneration process in polymer-fullerene organic solar cells relies strongly on the nanostructure and on the nano/picosecond dynamics occurring in these complex blends. Elastic and inelastic neutron scattering techniques are valuable tools with which to investigate those features in the appropriate time and space domains. In particular, quasi-elastic neutron scattering (QENS) connects useful structural and dynamical information by the measurement of dynamical incoherent (single particle) fluctuations in soft materials as a function of lengthscale. Extraction of these fluctuation rates can, however, be hampered by the presence of coherent contributions, originating from elastic scattering, and/or inelastic scattering modes which overlap in the space/time domain with the incoherent single-particle motions. As we have already seen in a previous study [1], this happens in poly(3-hexylthiophene) (P3HT) and [6,6]-Phenyl C61 butyric acid methyl ester (PCBM) solid blends, in which the coherent contribution arising from the PCBM crystalline phase seems to affect the interpretation of the polymer dynamics. Here, we utilise neutron polarisation analysis as an effective tool to separate coherent and incoherent contributions and make QENS data analysis of these blends more reliable.
| Type: | Article |
|---|---|
| Title: | Neutron polarisation analysis of Polymer: Fullerene blends for organic photovoltaics |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.polymer.2016.07.079 |
| Publisher version: | http://dx.doi.org/10.1016/j.polymer.2016.07.079 |
| Language: | English |
| Additional information: | Crown Copyright © 2016. Published by Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| Keywords: | Science & Technology, Physical Sciences, Polymer Science, Conjugated Polymers, Bulk Heterojunction, Charge-transport, Single-crystals, Active Layers, Scattering, Dynamics, Spectrometer, Morphology |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1531420 |
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