DOI: https://doi.org/10.29363/nanoge.inform.2019.065
Publication date: 8th January 2019
It is well known that charge transport layers, selective for electrons (ETL) or for holes (HTL), have a profound effect on the performance and stability of polymer solar cells. The most common HTL material in polymer solar cells, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS), has a high conductivity and transparency and is solution-processable. Knowing that PEDOT:PSS layer is also a significant cause of degradation due to its hygroscopic nature, alternative HTL materials, such as, for instance, thermally evaporated Molybdenum oxide (MoO3), are needed to obtain longer device life time. Here we explored solution-processed interfacial layers of Copper thiocyanate (CuSCN) and phosphomolybdic acid (PMA) as HTLs and found similar to improved device performance compared to the conventional HTLs. We present the surface morphology, optical properties, and surface electronic properties of thin films of these HTL materials using Atomic Force Microscopy (AFM), UV-Vis spectroscopy and Kelvin probe. The HTL layers were applied in polymer solar cells with the conventional architecture ITO/HTL/AL/LiF/Al devices, where the active layer (AL) is the polymer:fullerene blend, TQ1:PC70BM (1:3). The performance and charge carrier recombination behaviourof these solar cells with different HTL were compared.
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