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Model-based Quantitative Assessment of Crystallinity and Parasitic Absorption in Microcrystalline Silicon Solar Cells

  • Thomas Lanz (a1), Corsin Battaglia (a2), Christophe Ballif (a2) and Beat Ruhstaller (a1)

Abstract

We investigate the influence of the crystallinity of the absorber layer and parasitic absorption in the doped layers and electrodes on the external quantum efficiency and reflection of microcrystalline silicon (μc-Si:H) solar cells. Using an optical light scattering model we systematically study variations in the crystallinity and validate a simple normalization procedure that allows assessing the gains that can be achieved by reducing the parasitic absorption. The optimization potential is demonstrated with solar cell samples with increased crystallinity and eliminated parasitic absorption.

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1. Shah, A., Thin-film silicon solar cells (EPFL Press, CRC Press, 2010)
2. Battaglia, C., Erni, L., Boccard, M., Barraud, L., Escarre, J., Soderstrom, K., Bugnon, G., Billet, A., Ding, L., Despeisse, M., Haug, F.-J., Wolf, S. D., and Ballif, C., J. Appl. Phys. 109, 114501 (2011)
3. Lanz, T., Ruhstaller, B., Battaglia, C., and Ballif, C., J. Appl. Phys. 110, 033111 (2011)
4. Droz, C., Vallat-Sauvain, E., Bailat, J., Feitknecht, L., Meier, J., and Shah, A., SOLMAT 81, 61 (2004)

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