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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.
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
Contributeur : Lilloa Université de Lille <>
Soumis le : jeudi 20 février 2020 - 10:03:28
Dernière modification le : jeudi 20 février 2020 - 10:03:29
