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Fabrication of High Efficiency Flexible CIGS Solar Cell with ZnO Diffusion Barrier on Stainless Steel Substrate

Published online by Cambridge University Press:  11 July 2011

Bae Dowon
Affiliation:
LG Innotek Components R&D Center, Solar Cell Lab, Ansan, Republic of Korea
Kwon Sehan
Affiliation:
LG Innotek Components R&D Center, Solar Cell Lab, Ansan, Republic of Korea
Oh Joonjae
Affiliation:
LG Innotek Components R&D Center, Solar Cell Lab, Ansan, Republic of Korea
Lee Joowon
Affiliation:
LG Innotek Components R&D Center, Solar Cell Lab, Ansan, Republic of Korea
Kim Wookyoung
Affiliation:
Yeungnam Univ., School of Display and Chemical Engineering, Gyeongsan, Republic of Korea
Corresponding
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Abstract

i-ZnO layers were deposited as diffusion barriers fabricated by RF sputtering on stainless-steel substrates (SUS430, matches with AISI SUS24). It was found that the addition of ZnO layer between stainless-steel substrate and Mo back contact film deplete diffusion of metal ions from substrate and reduce recombination at CIGS layer, as identified by an SIMS depth profile, QE and C-V measurements. With such diffusion barriers, the efficiency, open-circuit voltage, short-circuit current and fill factor of CIGS solar cells all increased, compared to reference cells without diffusion barrier. For the better device performance, Na was supplied during Mo back-contact layer deposition by co-sputtering of the target, including Na-source. Efficiencies of cells were increased with increasing the quantity of Na source. Unlike barrier thickness effect, short circuit current was reduced and open circuit voltage, fill factor were increased with increasing Na-source, and achieved 12.6% efficiency without AR(anti-reflection) coating. The relationship and causality between these results and the Na-doping were analyzed using C-V measurements.

Type
Research Article
Copyright
Copyright © Materials Research Society 2011

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References

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Fabrication of High Efficiency Flexible CIGS Solar Cell with ZnO Diffusion Barrier on Stainless Steel Substrate
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Fabrication of High Efficiency Flexible CIGS Solar Cell with ZnO Diffusion Barrier on Stainless Steel Substrate
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