Investigation of Photo-degradation mechanism of semiconductor-organic material interface

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Semiconductor materials are now very important in various fields. Some of their properties such as photosensitive properties have not been well understood.We have investigated photodegradation of organic materials in which semiconductor materials such as small powders are included. Since we have enough experiences for electrochemical phenomena of photoexcited semiconductor-liquid interfaces, photoelectrochemical techniques have been employed. At first, photocatalytic activity of semiconductor surface was measured by using of semiconductor electrode insulated with oeganic layers. Photocurrent at the constant applied vias increased with irradiation time indicating that photoexcited holes formed in the valence band extracted electrons from the organic molecules. Therefore, the organic molecules were oxidized and degraded. Secondly we studied a new method named as photosinking for estimation of photocatalytic activity of semiconductor powders which were coated with some organic molecules with hydrophobic character. From the photosinking rate photocatalytic activity has been estimated.