The current state of CdTe/CdS solar cell development is reviewed with emphais on the understanding of the materials behaviour. Metallurgical and optoelectronic changes effected by the CdCl_2 treatment are described with reference to the CdS-CdCl_2 and CdTe-CdCl_2 phase diagrams. Some studies relating to the nature, distribution and influence of important optoelectronic centres are described and some new results presented. These include PL, EBIC and CL. The potential for complex interaction of processing steps in the materials system is noted and key areas for future studies are highlighted. direct c 1999 Elsevier Science B.V. All rights reserved.
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