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Nanomorphology of Bulk Heterojunction Organic Solar Cells in 2D and 3D Correlated to Photovoltaic Performance

Abstract : Control of the nanoscale morphology of the donor−acceptor material blends in organic solar cells is critical for optimizing the photovoltaic performances. The influence of intrinsic (acceptor materials) and extrinsic (donor:acceptor weight ratio, substrate, solvent) parameters was investigated, by atomic force microscopy (AFM) and electron tomography (ET), on the nanoscale phase separation of blends of a low-band-gap alternating polyfluorene copolymers (APFO-Green9) with [6,6]-phenyl-C71-butyric acid methyl ester ([70]PCBM). The photovoltaic performances display an optimal efficiency for the device elaborated with a 1:3 APFO-Green polymer:[70]PCBM weight ratio and spin-coated from chloroform solution. The associated active layer morphology presents small phase-separated domains which is a good balance between a large interfacial donor−acceptor area and continuous paths of the donor and acceptor phases to the electrodes.
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https://hal.univ-lille.fr/hal-02485351
Contributeur : Lilloa Université de Lille <>
Soumis le : jeudi 20 février 2020 - 10:03:28
Dernière modification le : jeudi 20 février 2020 - 10:03:29

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Sophie Barrau, Viktor Andersson, Fengling Zhang, Sergej Masich, Johan Bijleveld, et al.. Nanomorphology of Bulk Heterojunction Organic Solar Cells in 2D and 3D Correlated to Photovoltaic Performance. Macromolecules, 2009, Macromolecules, 42 (13), pp.4646-4650. ⟨10.1021/ma802457v⟩. ⟨hal-02485351⟩

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