Abstract
Trap levels in Cds or Cds like single crystals were studied by several workers using different techniques like Thermally Stimulated Conductivity (TSC), thermoluminescence etc. The trap parameters reported varied from author to author and various models were proposed to understand the trap structure. TSC studies on aged sprayed Cds films at high temperatures were reported by the present authors for the first time and the data was satisfactorily explained by a model proposed earlier. In this paper high temperature TSC of fresh as well as aged CdS films is reported. A continoous shifting of the TSC peak temperature with TEWC is observed in the case of fresh films. This is attributed to a continuous separation of electron hole pair traps with TEWC. However, in aged films such continuous separation was not observed in conformation with our earlier result. This was attributed to the locking of constituent electrons and holes in aged films. Thus the degradation in efficiency with time observed in CdS/Cu 2S solar cells could be due to the presence of these locked traps.
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