Bulk Sensitization of Inorganic Semiconductors with Organic Guest Molecules: Zink Phthalocyanines Embedded in μc-Si and ZnSe Host Matrices

Concepts of bulk sensitization of inorganic semiconductors by organic dye molecules either to increase the absorptivity of indirect semiconductors as μc-Si or to expand in a two photon process the absorption spectrum of wide gap semiconductors to photons of energy below the band gap are introduced. Hybrid composites have been prepared in vacuum by combining CVD and PVD thin film growth methods. Raman and optical spectroscopy have been used to prove the stability of the organic molecules ZnPc and F 16 ZnPc for the applied growth conditions of μc-Si and ZnSe, respectively. Photoelectron spectroscopy has been used to determine the frontier orbital line up of ZnPc and F 16 ZnPc versus the energy gaps of Si or ZnSe.