Determination of the optical constants of alpha- and beta-zinc (II)-phthalocyanine films

作者：Kozlik Michael; Paulke Soeren; Gruenewald Marco; Forker Roman; Fritz Torsten^*

来源：Organic Electronics, 2012, 13(12): 3291-3295.

DOI：10.1016/j.orgel.2012.09.030

• ZnPc
• UV-vis spectroscopy
• Phase transition
• Differential reflectance spectroscopy (DRS)
• Surface roughness
• Dielectric function

Here, we investigate the crystalline transition of zinc (II)-phthalocyanine from the metastable alpha-phase to the stable beta-phase by atomic force microscopy and ultraviolet-visible (UV-vis) spectroscopy. For this purpose, thin films were prepared on quartz glass substrates via physical vapor deposition and characterized before as well as after a well-defined annealing process. Accordingly, the phase transition at around 240 degrees C could be monitored by optical spectroscopy. Furthermore, the optical constants of alpha- and beta-ZnPc have been determined accurately from transmission and differential reflectance spectra, with the surface roughness taken into account. Kramers-Kronig-consistency of the optical constants obtained was checked by means of a numerical algorithm.

• 出版日期2012-12