Rare earths have been found to produce photosensitization in CdS, ZnSe and (CdSe, ZnS) in CdS the relative photosensitivity factor is found to be as high as 5950. Excitation spectral studies also support this effect due to rare earths.
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Cite this article:
Bhushan, Sharma, Giriya, and Abraham (1989). Sensitization effect of rare earths in the photoconductivity of some II-VI compounds. Journal of Ravishankar University (Part-B: Science), 2(1), pp. 56-61.