Stark spectroscopy of CuPc organic semiconductor with a submicron metal-electrode grating |
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Authors: | L. M. Blinov V. V. Lazarev S. G. Yudin S. P. Palto |
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Abstract: | The optical and electro-optical properties of organic copper phthalocyanine semiconductor (α- CuPc) have been investigated by Stark (electroabsorption) spectroscopy using a metal electrode grating with a submicron (0.88 μm) interelectrode distance. Differences between dipole moments (Δμ) and polarizabilities (Δα) in the excited and ground states of α-CuPc are measured for a nanoscale semiconductor film. It is concluded that the extremely high values of Δμ and Δα are in principle not parameters of individual α-CuPc molecules: they are determined by exciton effects specifically in the polycrystalline medium with a characteristic morphology of hyperfine films, which depends on the structure of the samples and their fabrication technology. |
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