Bromine and alkoxyl substituted copper phthalocyanine derivative thin films studied with spectroscopic ellipsometry

Tetrabromo-tetraalkoxyl substituted copper phthalocyanine (TBTACuPc), tetraalkoxyl substituted copper phthalocyanine (TACuPc) and copper phthalocyanine only (CuPc) thin films were prepared on single-crystal silicon. The optical and dielectric properties of these films were studied on a new type of scanning photometric ellipsometer in which the analyzer and polarizer rotate synchronously. The optical constants, dielectric function and absorption coefficients of these films have been obtained in the wavelength range 500-800 nm. It has been found that the substituted groups on the conjugated phthalocyanine macrocycles strongly influence resonance wavelength and abnormal dispersion of the thin films. (C) 2003 Elsevier B.V. All rights reserved.