Understanding the Role of Solvent Additives in Organic Solar Cells
At Sheffield, organic solar cells (OSCs) have been made using a new class of materials called non-fullerene acceptors (NFAs) producing high efficiency devices (9-11%) in polymer blends. For OSCs containing ITIC, a NFA, the inclusion of solvent additives (e.g. 1,8-diioodocatane (DIO)) in the blend solution increases efficiency at a detriment to stability, an effect which is not observed in OSCs containing PCBM, a more traditional material. From spectroscopic ellipsometry, we suspect this is due to a greater amount of residual DIO in ITIC-based devices after thermal annealing. NR on D17 will confirm this, allowing us to track DIO removal and characterise the vertical segregation in the plane normal to the film; a phenomenon that has been observed from previous measurements on D17. NR is essential to characterise the vertical profile and is made possible by using deuterated ITIC. We will also assess the crystallinity, grain size and orientation of individual components using GIWAXS in Sheffield along with larger lengthscales using SANS at ISIS. In combination, these measurements will help us achieve the optimum method for producing high efficiency OSCs with real-world stability.
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KILBRIDE Rachel; BURG Stephanie; GUTFREUND Philipp; JONES Richard A.L.; LIDZEY David; OBENG Melody; Andrew J. Parnell and SPOONER Emma. (2021). Understanding the Role of Solvent Additives in Organic Solar Cells. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1957
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