Enhanced exciton harvesting in a planar heterojunction organic photovoltaic device by solvent vapor annealing
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The singlet exciton diffusion length was measured in a small molecule electron donor material DR3TBDTT using fluorescence quenching at a planar interface with a cross-linked fullerene derivative. The one-dimensional exciton diffusion length was increased from ~16 to ~24 nm by annealing the film in carbon disulfide solvent vapor. Planar heterojunction solar cells were fabricated using bilayers of these materials and it was found that solvent vapor annealing increased the short circuit current density by 46%. This can be explained by improved exciton harvesting in the annealed bilayer.
Zhang , Y , Sajjad , M T , Blaszczyk , O , Ruseckas , A , Serrano , L A , Cooke , G & Samuel , I D W 2019 , ' Enhanced exciton harvesting in a planar heterojunction organic photovoltaic device by solvent vapor annealing ' , Organic Electronics , vol. 70 . https://doi.org/10.1016/j.orgel.2019.03.014
Copyright © 2019 Published by Elsevier B.V. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1016/j.orgel.2019.03.014