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High Haze and Low Resistive MgO/AZO Bi-layer Transparent Conducting Oxide for Thin Film Solar Cells

Published online by Cambridge University Press:  07 July 2011

Dong Won Kang
Affiliation:
Electrical Engineering, Seoul National University, Seoul, 151-742, Republic of Korea
Jong Seok Woo
Affiliation:
Electrical Engineering, Seoul National University, Seoul, 151-742, Republic of Korea
Sung Hwan Choi
Affiliation:
Electrical Engineering, Seoul National University, Seoul, 151-742, Republic of Korea
Seung Yoon Lee
Affiliation:
Solar Energy group, LG Electronics, Seoul, 137-724, Republic of Korea
Heon Min. Lee
Affiliation:
Solar Energy group, LG Electronics, Seoul, 137-724, Republic of Korea
Min Koo. Han
Affiliation:
Electrical Engineering, Seoul National University, Seoul, 151-742, Republic of Korea
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Abstract

We have propsed MgO/AZO bi-layer transparent conducting oxide (TCO) for thin film solar cells. From XRD analysis, it was observed that the full width at half maximum of AZO decreased when it was grown on MgO precursor. The Hall mobility of MgO/AZO bi-layer was 17.5cm2/Vs, whereas that of AZO was 20.8cm2/Vs. These indicated that the crystallinity of AZO decreased by employing MgO precursor. However, the haze (=total diffusive transmittance/total transmittance) characteristics of highly crystalline AZO was significantly improved by MgO precursor. The average haze in the visible region increased from 14.3 to 48.2%, and that in the NIR region increased from 6.3 to 18.9%. The reflectance of microcrystalline silicon solar cell was decreased and external quantum efficiency was significantly improved by applying MgO/AZO bi-layer TCO. The efficiency of microcrystalline silicon solar cell with MgO/AZO bi-layer front TCO was 6.66%, whereas the efficiency of one with AZO single TCO was 5.19%.

Type
Research Article
Copyright
Copyright © Materials Research Society 2011

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References

REFERENCES

1. Müller, J., Rech, B., Springer, J., and Vanecek, M., Sol. Energy 77, 917 (2004).CrossRefGoogle Scholar
2. Berginski, M., Hükes, J., Gordign, A., Reetz, W., Wätjen, T., Rech, B., and Wuttig, M., Sol.Energ. Mat. Sol. Cells, 92, 10371042, (2008).CrossRefGoogle Scholar
3. Fujita, M., Kawamoto, N., Sasajima, M., and Horikoshi, Y.: J. Vac. Sci. Technol. B 22, 1484 (2004).CrossRefGoogle Scholar

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High Haze and Low Resistive MgO/AZO Bi-layer Transparent Conducting Oxide for Thin Film Solar Cells
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