Abstract
ELECTROCHEMICALLY DEPOSITED OF CdTe-USING TWO ELECTRODE SYSTEM FOR SOLAR CELL APPLICATION
G. E. A. Muftah*, Mabrouk Hassan and I. M. Dharmadasa
ABSTRACT
The aim of this work was to make low cost thin film solar cells by electro deposition, using cadmium telluride (CdTe) in presence of the chlorine treatment of CdTe. CdTe films were electrochemically deposited from aqueous solutions using both two. Different preparative parameters such as growth voltage and heat treatment conditions were optimised by measuring the I-V characteristic of glass/FTO/CdS/CdTe/Au devices. The device efficiency was high at a growth voltage of 1570 mV. The optimum annealing conditions were 350?C for 20 minutes in air. It is established that treating CdTe with chlorine has a beneficial effect on the solar cell device. For comparison, untreated and treated CdTe were characterised by various techniques. XRD analysis showed a cubic structure, with a significant increase in intensity from the (111) reflection in present of chlorine treatment. Optical absorption shows a band gap energy of 1.50 eV with a good absorbance slope. A considerable change in the morphology between untreated and treated CdTe was observed by SEM. I-V measurements of completed chlorine treated glass/FTO/CdS/CdTe/Au devices showed a significant improvement in efficiency. The best efficiency obtained was 8.7%.
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