Interfacial studies of charge transport layers in non-fullerene bulk heterojunction organic solar cell blends using neutron reflectivity
At Sheffield, we have been testing organic solar cells using a new kind of non-fullerene acceptor, called ITIC, which when blended with polymer semiconductors makes high efficiency devices, 8%-10%. Our device results show a big difference in efficiency according to which surface we spin coat the blend onto. Previous results with fullerene acceptors have shown that these differences can arise from self-stratification of the components during spin coating. Experiments on D17 will confirm or disprove this hypothesis by measuring the depth profile perpendicular to the plane of the film. Neutron reflectivity is key to measuring the vertical composition, and we will also measure the nano-morphology using transmission SANS on our existing beam time at LOQ. Alongside this we will use GIWAXS to measure the crystallinity and orientation of the film components. All together the insight from these measurements will guide further improvement and understanding of how best to process these materials to make high efficiency devices.
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KILBRIDE Rachel; GUTFREUND Philipp; JONES Richard A.L.; LIDZEY David; Andrew J. Parnell; SEXTON Thomas and SPOONER Emma. (2019). Interfacial studies of charge transport layers in non-fullerene bulk heterojunction organic solar cell blends using neutron reflectivity. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1902
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