Berlin 2012 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 44: Poster IV: Thin film photovoltaics; Organic electronics and photovoltaics (jointly with CPP, HL, O); Organic thin films; Trends in atomic layer deposition (Focused session)

DS 44.24: Poster

Freitag, 30. März 2012, 09:30–12:00, Poster E

Influence of different additives to an organic hole conductor for hybrid photovoltaics — •Ingolf Segger, Ulrike Kuck, Sascha Hackmann, and Matthias Wuttig — I. Institute of Physics (IA), RWTH Aachen University, 52056 Aachen, Germany

In recent years, remarkably high power conversion efficiencies have been reported for dye sensitized solar cells (DSSCs). Therefore they are considered as a promising candidate for market-relevant thin-film solar cells. However, high performance DSSCs usually employ a liquid iodide-based electrolyte as an essential component for dye regeneration which introduces significant drawbacks for commercialisation like thermal instability and the requirement for highly reliable sealing techniques.

It has been shown that the organic hole conductor 2,2',7,7'-tetrakis(N,N-di-p-methoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) has the potential to replace the liquid electrolyte in DSSCs. In order to achieve high power conversion efficiencies in such solid-state DSSCs, different additives to spiro-OMeTAD like Lithium bis(trifluoromethylsulfonyl)imide (Li-TFSI) and pyridine derivatives are required. Both optical properties and the electronic structure of materials used in photovoltaics play an important role for device performance. Therefore in this study spiro-OMeTAD thin-films with the addition of those different essential additives were investigated by means of photoluminescence spectroscopy, UV-VIS absorption spectroscopy and photoemission spectroscopy.