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Annealing time and collection efficiency in electrodeposited CdS/CdTe solar cells

Published online by Cambridge University Press:  21 March 2011

G. Agostinelli ,
E.D. Dunlop ,
B. Ebner  and
N. Gibson
G. Agostinelli
Affiliation:
European Commission, Joint Research Centre, TP 450, 21020 Ispra (VA), ITALY
E.D. Dunlop
Affiliation:
European Commission, Joint Research Centre, TP 450, 21020 Ispra (VA), ITALY
B. Ebner
Affiliation:
European Commission, Joint Research Centre, TP 450, 21020 Ispra (VA), ITALY
N. Gibson
Affiliation:
European Commission, Joint Research Centre, TP 450, 21020 Ispra (VA), ITALY
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Abstract

This paper presents a detailed analysis of the spatially resolved evolution of External Quantum Efficiency of electrodeposited CdS/CdTe solar cells as a function of the duration of the post-deposition annealing process which promotes n to p-type conversion of electrodeposited CdTe. Strips of 30×4 cm were cut from deposited plates at various stages of the fabrication process and processed into cells. Annealing treatments were carried out on these strips at 400°C for times ranging from 1 to 120 minutes. 130 spectral response curves (in the range of 300 to 900 nm) have been measured to trace temporal evolution and spatial non-uniformity of the materials and extrapolate parameters such as effective diffusion lengths, evolution of the collection profiles, and junction depth. Correlation between these parameters suggests that recrystallisation does not take place uniformly but progresses through the film. The analysis of structural vs. optical parameters along the cells provides evidence for spatial non-uniformities of the state of crystallisation of as-deposited and annealed material. Poor performance has been observed near the edges of the cells where material is resistant to recrystallisation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 668: Symposium H – II-IV Compound Semiconductor Photovoltaic Materials , 2001 , H9.9
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

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