Sulfonate-Conjugated Polyelectrolytes as Anode Interfacial Layers in Inverted Organic Solar Cells

Molecules

Silvia Luzzati¹  Roberto Sorrentino¹  Guido Scavia¹  Francesco Galeotti¹  BenedettaMaria Squeo¹  Mariacecilia Pasini¹  Maristella Gussoni¹  Elisa Lassi¹  Simona Mrakic-Sposta²  Barbara Vercelli³ 

[1] Institute of Chemical Sciences and Technologies “G. Natta ”-SCITEC, National Research Council, CNR-SCITEC, via Corti 12, 20133 Milan, Italy;Institute of Clinical Physiology, National Research Council, CNR-IFC, Piazza Ospedale Maggiore 3, 20162 Milan, Italy;Institute of Condensed Matter Chemistry and Technologies for Energy, National Research Council, CNR-ICMATE, Via Roberto Cozzi 53, 20125 Milan, Italy;

关键词: conjugated polyelectrolytes;    inverted organic solar cells;    anode interfacial layers;   

DOI  :  10.3390/molecules26030763

来源: DOAJ

【 摘 要 】

Conjugated polymers with ionic pendant groups (CPEs) are receiving increasing attention as solution-processed interfacial materials for organic solar cells (OSCs). Various anionic CPEs have been successfully used, on top of ITO (Indium Tin Oxide) electrodes, as solution-processed anode interlayers (AILs) for conventional devices with direct geometry. However, the development of CPE AILs for OSC devices with inverted geometry is an important topic that still needs to be addressed. Here, we have designed three anionic CPEs bearing alkyl-potassium-sulfonate side chains. Their functional behavior as anode interlayers has been investigated in P3HT:PC₆₁BM (poly(3-hexylthiophene): [6,6]-phenyl C61 butyric acid methyl ester) devices with an inverted geometry, using a hole collecting silver electrode evaporated on top. Our results reveal that to obtain effective anode modification, the CPEs’ conjugated backbone has to be tailored to grant self-doping and to have a good energy-level match with the photoactive layer. Furthermore, the sulfonate moieties not only ensure the solubility in polar orthogonal solvents, induce self-doping via a right choice of the conjugated backbone, but also play a role in the gaining of hole selectivity of the top silver electrode.

【 授权许可】

Unknown