Potential of zinc oxide nanowhiskers as antireflection coating in crystalline silicon solar cell for cost effectiveness
Antireflection coatings play an important role in enhancing the performance of crystalline silicon solar cells by increasing the light coupling into the active region of the devices. In this work we investigated the effects of seed layer thickness and growth time on the reflection properties of solution-grown zinc oxide nanowhiskers. Our results reveal the potential of zinc oxide nanowhiskers as antireflection coating in crystalline silicon solar cells as investigated herein. With this efficient antireflection coating, we have presented a hierarchical structure integrating zinc oxide nanowhisker arrays on silicon micropyramids for improving the energy conversion efficiency. This structure displays broadband reflection suppression in the 300–1200 nm range, with an integrated reflectance of 2.28%. A conversion efficiency of 13.3% was obtained, which is significantly high for large area (3″ × 3″) solar cell fabricated using zinc oxide nanowhiskers as the antireflection coating layer.
This work has been supported by the Ministry of New and Renewable Energy (MNRE) (31/40/2010-11/PVSE), Govt. of India, Department of Science and Technology (DST) (DST/TM/CERI/D09 (G)). The authors are highly obliged to Prof. A.K. Barua for his enormous support, guidance and help. The authors are also grateful to Prof. H Saha, Principal Investigator of the project for his encouragement and help.
- 3.J. Szlufcik, K. De Clercq, P. De Schepper, J. Poortmans, A. Buczkowski, J, Nijs, in Proceedings of the 12th European Photovoltaic Solar Energy Conference, Amsterdam. (1994) pp. 1018–1021Google Scholar