New Electrode and Hole Transport Layer Materials for OPV and Perovskite PV Applications

Wilfried Loevenich^a, Jan Seuring^a, Nina Kausch-Busies^a, Herbert Fuchs^a, Detlef Gaiser^a, Arnulf Scheel^a, Andreas Elschner^a, Stefan Schumann^a

^aHeraeus Precious Metals GmbH & Co. KG, Chempark Leverkusen / Gebäude B 202, Leverkusen, 51368, Germany

International Conference on Hybrid and Organic Photovoltaics
Proceedings of International Conference on Hybrid and Organic Photovoltaics 2015 (HOPV15)

Roma, Italy, 2015 May 11th - 13th

Organizer: Filippo De Angelis

Poster, Stefan Schumann, 005
Publication date: 5th February 2015

In this contribution new solution-processable Poly(ethlyendioxythiophene) (PEDOT) and electrode materials for organic photovoltaic (OPV) applications will be introduced. This includes materials and concepts for inverted architecture and ITO-free OPV devices as well as solution processed metallic silver and a new material range of completely water-free organic solvent based PEDOT.¹ This highly complementary set of new developments allows the realization of an all solution-processable approach to OPV addressing important points for large scale production and compatibility. Different PEDOT:PSS dispersions have been developed and tailored towards their use as hole transport layers and transparent conductive electrodes in OPV devices. For inverted structure top contacts a highly conductive grade with very good film formation and wettability on photoactive layers was developed to allow semi-transparent grid based top contacts. A second type is based on organic solvent PEDOT:PSS sytems with enhanced adhesion to the photo-active layer increasing the stack robustness. For the bottom contact a highly transparent PEDOT smoothening layer is presented which demonstrates a high transparency even with a few hundred nanometer film thickness. This material was designed to be combined with silver grids or silver nanowire mesh for ITO-free devices. A highlight will be the introduction of different metallic silver materials applicable to a variety of substrates and architectures. For bottom grids different low-temperature (<250 °C) silver resinates can be printed to form uniform and structured metallic silver grids with clear advantages over metal inks including high conductivity and smooth metallic surface. Our organic solvent based PEDOT range highlights a new class of organic electronics materials which are based on non-polar solvents and are completely water-free. Different solvent systems are possible allowing a versatile orthogonal approach for numerous applications including perovskite PV cells were it can be applied on top of the photoactive layer potentially replacing spiro-OMeTAD.

Lövenich, W. PEDOT—Properties and Applications. Polymer Science, Ser. C 2014, 56, 1, 136-144.

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