Skip to main content Accessibility help
×
Home

Improved Back Reflector for High Efficiency Hydrogenated Amorphous and Nanocrystalline Silicon Based Solar Cells

  • Baojie Yan (a1), Jessica M. Owens (a1), Chun-Sheng Jiang (a2), Jeffrey Yang (a1) and Subhendu Guha (a1)...

Abstract

Ag/ZnO back reflectors (BR) on specular stainless steel substrates are optimized for hydrogenated amorphous silicon germanium alloy (a-SiGe:H) and nanocrystalline silicon (nc-Si:H) solar cells. The BRs are deposited using a sputtering method. The texture of the Ag and ZnO layers is controlled by deposition parameters as well as chemical etching with diluted HCl. The surface morphology is investigated by atomic force microscopy. The scattered light intensity from a He-Ne laser, which illuminates the sample surface perpendicularly, is measured at different angles. Finally, a-SiGe:H and nc-Si:H solar cells are deposited on the BR substrates prepared under various conditions. For a-SiGe:H bottom cells, the improved BR with large micro-features leads to an enhanced open-circuit voltage. For the nc-Si:H solar cells, large micro-features on the improved BR eliminate interference fringes otherwise observed in the quantum efficiency measurement and result in high short circuit current density. The result is consistent with an enhanced scattered light intensity. Hence, the cell performance was improved. We also deposited a-Si:H/a-SiGe:H/nc-Si:H triple-junction cells on the optimized BR and achieved a high initial active-area efficiency of 14.6%.

Copyright

References

Hide All
[1] Banerjee, A. and Guha, S., J. Appl. Phys. 69, 1030 (1991).10.1063/1.347418
[2] Yang, J., Banerjee, A., and Guha, S., Appl. Phys. Lett. 70, 2975 (1997).10.1063/1.118761
[3] Shah, A.V., Meier, J., Vallat-Sauvain, E., Wyrsch, N., Kroll, U., Droz, C., and Graf, U., Solar Energy Materials & Solar Cells 78, 469 (2003).10.1016/S0927-0248(02)00448-8
[4] Yan, B., Yue, G., Yang, J., Banerjee, A., and Guha, S., Mater. Res. Soc. Symp. Proc. 762, 309 (2003).
[5] Yan, B., Yue, G., Lord, K., Banerjee, A., and Guha, S., Proc. of 3rd World Conf. on Photovoltaic Energy Conversion (Osaka, Japan, 2003), p. 2773.
[6] Müller, J., Schöpe, G., Kluth, O., Rech, B. Ruske, M., Trube, J., Szyszka, B., Höing, Th., Jiang, X., and Bräuer, G., Proc. of 28th IEEE Photovoltaic Specialist Conf. (Anchorage, AK, 2000), p. 758.
[7] Yan, B., Yue, G., Yang, J., Guha, S., Williamson, D. L., Han, D., and Jiang, C.-S., Appl. Phys. Lett. 85, 1955 (2004).10.1063/1.1788877

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed