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Diffusion of atoms across the CdS/CdTe interface during post-deposition annealing is thought to have an important effect on the performance of CdS/CdTe-based solar cells. Thin-film solar cell samples were annealed at 400°C for three different times. The samples were etched sequentially in a bromine/methanol solution and then examined with Auger depth profiling and X-ray diffraction. Profiling showed the as-deposited samples to have little or no interfacial mixing, but annealing even for a short time caused diffusion of sulphur into the CdTe material. As the annealing times lengthened, the concentration of sulphur in the CdTe increased. X-ray diffraction measurements indicated that the CdS layer rapidly crystallized into its hexagonal Greenockite modification, but with lattice parameters increased by 0.8%. This changed little with annealing time. The CdTe near the interface appeared to have a modified but well-defined cubic structure with respect to reference CdTe, as indicated by splitting of the diffraction peaks, denoting the growth of a CdTexSy interfacial layer. This layer increased in thickness with annealing time and most probably has a stoichiometry within the range CdTeS(0.04)-CdTe(0.88)S(0.12).

Additional information

Authors: OZSAN M E, Teksolar Ltd., Woking (GB);GIBSON P N, European Commission, Joint Research Centre, Institute for Health and Consumer Protection, Ispra (IT);BAKER M A, Surface Analysis Laboratory, School of Engineering, University of Surrey, Guildford (GB);ÖZSAN M E, Teksolar Ltd., Woking (GB)
Bibliographic Reference: An article published in: Surface and Interface Analysis Volume 33, Issue 10-11, (2002), pp.825-829
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