Journal article 1219 views 181 downloads
Mixing in PCBM/P3HT bilayers, using in situ and ex situ neutron reflectivity
,
Philipp Gutfreund,
David James
Journal of Materials Research, Pages: 1 - 11
Swansea University Author:
Anthony Higgins
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DOI (Published version): 10.1557/jmr.2017.59
Abstract
In situ and ex situ neutron reflectivity is used to characterize annealed regioregular-P3HT/PCBM bilayers. In situ annealing of a 20 nm PCBM/35 nm P3HT bilayer at 170 °C reveals rapid mixing of PCBM and P3HT to produce a polymer-rich layer that contains around 18–20% PCBM. Samples with three differe...
| Published in: | Journal of Materials Research |
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| ISSN: | 0884-2914 2044-5326 |
| Published: |
2017
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| Online Access: |
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa31856 |
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| Abstract: |
In situ and ex situ neutron reflectivity is used to characterize annealed regioregular-P3HT/PCBM bilayers. In situ annealing of a 20 nm PCBM/35 nm P3HT bilayer at 170 °C reveals rapid mixing of PCBM and P3HT to produce a polymer-rich layer that contains around 18–20% PCBM. Samples with three different thicknesses of P3HT layer are ex situ annealed at 140 °C. This again reveals migration of PCBM into the P3HT and vice versa, with the polymer-rich layer in the 20 nm PCBM/35 nm P3HT sample containing 19% PCBM. Complete migration of the entire PCBM layer into the P3HT layer is observed for a 20 nm PCBM/80 nm P3HT bilayer. The robustness of fitted model composition profiles, in comparison with real-space imaging of sample surface morphology and previous work on annealed P3HT/PCBM bilayer compositions, is discussed in detail. |
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| College: |
Faculty of Science and Engineering |
| Start Page: |
1 |
| End Page: |
11 |