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 44.42: Poster

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

Impact of Annealing of Structural, Optical and Electrical Properties of CoPc thin films — Husam El-Nasser¹, •Dominik Meyer², Philip Schulz², Christian Effertz², and Matthias Wuttig² — ¹Departement of Physics, Al al-Bayt University, Mafraq-Jordan — ²I. Institute of Physics (IA), RWTH Aachen University, Germany

Organic materials are well known for their high potential as cost-efficient alternatives in the field of thin film based optoelectronic devices. Especially the wide range of possible materials offers promising opportunities to tailor crucial optical and electronic properties of the functional layers. Metal-phthalocyanines are commonly employed as p-type semiconducting layer in organic electronics. Yet the choice of the central metal atom has significant impact on the inter- and intramolecular characteristics. In this study we investigate structural, optical and electrical properties of cobalt-phthalocyanine (CoPc) as an alternative to the regularly used CuPc and ZnPc with a wide range of analytical setups. The XRD diffraction pattern present CoPc to be of high crystal order with a single sharp peak at 2 θ = 6.9 ^∘ corresponding to an interlayer spacing of d = 12.72 Å. Subsequent annealing revealed an increase of the mean grain size from 11 nm to 26 nm for the as deposited and annealed samples, respectively. The effect of annealing to optical constants as well as the charge carrier mobility is analyzed. Finally, we conclude on the impact of annealing affects to improve the suitability of this molecule for optoelectronic applications and to understand the driving forces in thin film formation and charge transport.