Optical Constants of α‐ and β‐Zinc(II)‐Phthalocyanine Films

Abstract

We present a dataset of the optical constants of -and -zinc(II)-phthalocyanine (ZnPc). They were determined accurately from transmission and differential reflectance spectra, with the surface roughness taken into account. For this purpose, thin films were prepared on quartz glass substrates via physical vapor deposition and characterized by ultraviolet-visible (UV-Vis) spectroscopy before as well as after a well-defined annealing process. Kramers-Kronig consistency of the optical constants obtained was checked by means of a numerical algorithm.

Principal processes of organic-inorganic hybrid solar cells using the example of ZnPc with ZnO

“…), being characterized by two distinct absorption peaks, if illuminated from the ZnO side. The crystal phase was determined by comparing to the optical data of both the α‐ and the β‐phase of ZnPc . Especially, the features in the range between 1.55 eV and 2.25 eV can be linked to the organic part, i.e., the typical Q x ‐ and Q y ‐peaks of the Q‐band, which are generally observed in optical spectra of many phthalocyanines.…”

“…Naturally, this effect is thickness dependent and appears most strongly for thick ZnPc layers. As the entire spectral shape of the EQE depends only on the optical constants, the thickness, and the exciton diffusion length, the last parameter can be determined since the first two are already known from previous work .…”

“…Knowing d and α ( E i ) from optical experiments , the only missing parameter is the inverse exciton diffusion length β . The best result for the curves in Fig.…”