2nd International Conference on “Energy and Environmental Protection in Sustainable Development”

Hikmat S. Hilal's picture
Research Title: 
Preparation, characterization, modification and application of thin-film cadmium chalcogenide semiconductors: enhancement of solar conversion efficiency and stability
Hikmat S. Hilal
Tue, 2009-11-10
Research Abstract: 

In earlier studies, we demonstrated new simple techniques to modify characteristics of monolithic semiconductor electrodes (such as n-Si and n-GaAs) in light-to-electricity conversions. A combination of two methods, namely: cooling rate and coverage with electro-active ions (embedded inside polymer matrices) simultaneously enhanced both conversion efficiency and stability of the electrodes.  Due to preparation difficulty and high cost of highly pure monolithic electrodes, research has recently been focused on thin-film semi-conducting (SC) material electrodes, prepared by chemical bath deposition (CBD). However, such thin-film electrodes suffer low efficiency of conversion, and low stability under photo-electrochemical (PEC) conditions. More research is thus needed to modify thin-film electrodes for future PEC applications.

To enhance efficiency and stability of new CBD-based thin-film SC electrodes, we employed our earlier techniques, cooling rate and electro-active species attachment, to cadmium chalcogenide (CdX: where X = S or Se) thin-film electrodes. The results are encouraging. Both electrode efficiency and stability of CdS electrodes have been significantly enhanced. Moreover, CBD-based CdSe films, which have not been described before in PEC systems, has been prepared here and stabilized for the first time ever.

In this presentation, details of preparation, modification, characterization (electronic absorption spectra, fluorescence spectra, XRD and SEM) results and PEC characteristic will be described. Future perspectives of commercializing these results will also be discussed.