Regensburg 2013 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 65: Poster: Organic electronics and photovoltaics (CPP; jointly with HL, O)
HL 65.18: Poster
Wednesday, March 13, 2013, 16:30–18:30, Poster C
Encapsulation of small molecule organic devices by a functional thin top layer of tetratetracontane — •Florian Staub1, Andreas Steindamm1,2, Michael Brendel1,2, and Jens Pflaum1,2 — 1Experimental Physics VI, Julius-Maximilians-University, 97074 Würzburg — 2ZAE Bayern, 97074 Würzburg
Providing long-term stability for organic devices is still a challenging task due to the sensitivity of molecular materials as well as organic/metal interfaces on water incorporation and oxidation processes. The straight-chain alkane tetratetracontane (TTC) is capable to protect organic devices from those degradation mechanisms by forming closely packed and highly crystalline films [1]. TTC is transparent in the visible range, highly hydrophobic and chemically inert and therefore suited to conserve the opto-electronic properties of the underlying films. In this contribution we apply nanometer thick top layers of TTC by thermal vacuum deposition onto planar heterojunction organic photovoltaic cells (OPVCs) based on zinc phthalocyanine (ZnPc) and diindenoperylene (DIP) in combination with the acceptor C60, respectively. For ensuring best comparability, encapsulated and bare cells are prepared under identical conditions on the same substrate. We investigate the degradation mechanisms by measuring the external quantum efficiency and the IV-characteristics over time under exposure to various environmental conditions (vacuum, nitrogen, air). The occurring changes in the opto-electronic device performance will be discussed in relation with structural data obtained by AFM and X-ray diffraction. [1] M. Göllner et al., Adv. Mater. 2010, 22, 4350-4354