C. Kollia

CdSe semiconducting layers produced by pulse electrolysis

Thin films of CdSe semiconductors electro deposited from acid aqueous electrolytes onto Ti substrates have been developed using periodically modified currents, such as pulse current. The products obtained were fully characterized and their photoelectric behavior was studied using a photo electro chemical cell. All deposits obtained by pulse electrolysis exhibit some differences in their structure, surface morphology and photoelectric properties, depending on the imposed pulse current parameters such as pulse frequency and duty cycle. It was also found that increased photoelectrochemical efficiencies are observed to so higher pulse frequencies as more negative deposition potentials are applied and vice-versa.

Development of new CdTe based hybrid semiconducting layers produced in one step by electro-codeposition

Thin layers of new hybrid organic-inorganic semiconductors, exhibiting photoconductive properties have been produced by a new, one step method. The films result by the combination of a CdTe semiconductor with an appropriate slightly water soluble fullerene salt. The layers were prepared using a cathodic electro-codeposition technique from an electrolytic bath containing both the convenient inorganic and organic chemical species. Using XRD and SEM-EDAX techniques the development of a new hybrid semiconductive system was confirmed. The photoconductive behavior of the new materials obtained was confirmed by photoelectrochemical measurements. The electro-codeposition technique applied could permit the achievement of various new hybrid materials with interesting semiconducting behavior, selecting either the appropriate inorganic and organic reagents or the imposed electrolysis conditions.