Regensburg 2013 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 30: Organic electronics and photovoltaics I (DS, jointly with CPP, HL, O)

HL 30.4: Vortrag

Montag, 11. März 2013, 18:00–18:15, H32

Optoelectronic Properties Of Zinc(II)-Phthalocyanine — •Michael Kozlik, Sören Paulke, Marco Gruenewald, Roman Forker, and Torsten Fritz — University of Jena, Institute of Solid State Physics, Helmholtzweg 5, 07743 Jena, Germany

Zinc phthalocyanine (ZnPc) is an organic molecule which is used in organic optoelectronic devices, such as OLEDs and organic solar cells. Bulk material is represented mainly in form of the metastable α-ZnPc, while the stable β-ZnPc is less conductive [1]. We show the critical transformation temperature as well as optical and morphological differences between both phases. Description and simulation of the performance of organic devices make use of material parameters. In our work we present the determination of the optical constants and the exciton diffusion length. Experimental methods are UV-Vis spectroscopy and external quantum efficiency. By transmittance and reflectance spectra we derive the real and imaginary part of the refractive index [2]. In combination with the derived parameters we show the performance of a simplified photovoltaic cell and identify the region of exciton dissociation and exciton diffusion length.

References

[1] K. Wihksne et al., J. Chem. Phys. 34 (1961) 2184.

[2] M. Kozlik et al., Org. Electron. 13 (2012) 3291.