Skip to main content Accessibility help
×
Home

Materials and Interface Optimization of Heterojunction Silicon (HIT) Solar Cells Using in-situ Real-Time Spectroscopic Ellipsometry

  • D.H. Levi (a1), C.W. Teplin (a1), E. Iwaniczko (a1), R.K. Ahrenkiel (a1), H.M. Branz (a1), M.R. Page (a1), Y. Yan (a1), Q. Wang (a1) and T.H. Wang (a1)...

Abstract

We have applied real-time spectroscopic ellipsometry (RTSE) as both an in-situ diagnostic and post-growth analysis tool for hydrogenated amorphous silicon (a-Si:H)/crystalline silicon (c-Si) heterojunction with intrinsic thin-layer (HIT) solar cells grown by hot-wire chemical vapor deposition. RTSE enables precise thickness control of the 5 to 25 nm layers used in these devices, as well as monitoring crystallinity and surface roughness in real time. Utilizing RTSE feedback, but without extensive optimization, we have achieved a photovoltaic energy conversion efficiency of 14.1% on an Al-backed p-type Czochralski c-Si wafer coated with thin i and n layers on the front. Open-circuit voltages above 620 mV indicate effective passivation of the c-Si surface by the a-Si:H intrinsic layer. Lifetime measurements using resonant coupled photoconductive decay indicate that surface recombination velocities can approach 1 cm/s. RTSE and transmission electron microscopy show that the intrinsic a-Si:H i-layers grow as a mixture of amorphous and nano-crystalline silicon.

Copyright

References

Hide All
1 Wakisaka, K., Taguchi, M., Sawada, T., Tanaka, M., Matsuyama, T., Matsuoka, T., Tsuda, S., Nakano, S., Kishi, Y., Kuwano, T., Conference Record, 22nd PVSC, Las Vegas, 887892 (1991).
2 Kawamoto, K., Nakai, T., Baba, T., Taguchi, M., Sakata, H., Tsuge, S., Uchihashi, K., Tanaka, M., and Kiyama, S., Technical Digest 12th Intern. PVSEC, Korea, 289290 (2001).
3 Jensen, N., Hausner, R.M., Bergmann, R.B., Werner, J. H., and Rau, U., Prog. Photovolt. Res. Appl., 1–13 (2002).
4 Stangl, R., Froitzheim, A., Elstner, L., and Fuhs, W., 17th EPVSEC, Munich, 345, (2001).
5 Wang, Q., Page, M. R., Xu, X. Q., Iwaniczko, E., Williams, E., and Wang, T. H., Thin Solid Films 430, 208211(2003).
6 Ahrenkiel, R.K., Keyes, B.M., and Johnston, S., Surface Engineering 16, 54(2000).
7 Cody, G.D. In: Pankove, J.I. (Ed.), Semiconductors and Semimetals, Vol. 21, Part B, Academic Press, New York, 1984, p11.
8 Ferlauto, A.S., Ferreira, G.M., Chen, C., Rovira, P.I., Wronski, C.R., Collins, R.W., Deng, X., Ganguly, G., Photovoltaics for the 21st Century II, ed McConnell, R.D., 199228(2001).
9 Takato, H., Sakata, I., Shimokawa, R., to be published in Proceedings of the 3rd World Conference on Photovoltaic Energy Conversion, Osaka, Japan, (2003).
10 Ahrenkiel, R. K. and Dashdorj, J., European Journal of Physics (in press).

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