Bilevel contact solar cells

Details Bilevel contact solar cells Bilevel contact solar cells

1989-05-08

1991-10-01

Weisstuch, Aaron

Batteries: thermoelectric and photoelectric

Photoelectric

Cells

136255, 437 2, 357 30, H01L 3106, H01L 3118

Patent

active

050530836

ABSTRACT:
A high efficiency back side contact solar cell is fabricated using a self-aligning process that reduces the number of masks and alignments as compared with prior processes. The back surface of the cell is patterned by etching into an array of bilevel, interdigitated mesas and trenches, separated by inclined surfaces. Doping of the back surface region produces laterally alternating and overlapping P and N regions associated with the mesas and trenches. A metalization layer is deposited over the entire back side of the cell. The portions of the metalization on the inclined surfaces are readily removed by etching. Removal of the metalization on the inclines surfaces separates the mesa conductors from the trench conductors, leaving a well defined interdigitated array of positive electrodes and negative electrodes.

REFERENCES:
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patent: 4838952 (1989-06-01), Dill et al.
F. W. Sexton et al., J. Electrochem. Soc., vol. 129, pp. 2624-2628 (1982).
R. A. Sinton et al., Proc. E. C. Photovoltaic Solar Energy Conf. (Sep. 1989).
Terry I. Chappell, "The V-Groove Multijunction Solar Cell", Proc. IEEE Photovoltaic Specialist Conference (1978), pp. 791-796.
Michael D. Lammert et al., "The Interdigitated Back Contact Solar Cell . . . ", IEEE Trans. Electron Devices, vol. ED-24, No. 4, Apr. 1977, pp. 337-342.
P. Verlinder et al., "High Efficiency Interdigitated Back Contact Silicon Solar Cells", Proc. 19th IEEE Photovoltaic Specialist Conf., 1987, pp. 405-410.
R. J. Schwartz, "Review of Silicon Solar Cells for High Concentrations", Solar Cells, vol. 6 (1982), pp. 17-38.
"Novel Implementations of Backside-Contact Silicon Solar Cell Designs in One-Sum and Concentrator Applications", R. A. Sinton et al., Proc. 4th Int. Photovoltaic Conference, Sydney, Australia, Feb. 14-17, 1989.
"Simplified Backside-Contact Solar Cells", Ronald A. Sinton et al., IEEE Trans. on Electron Devices, vol. 37, No. 2, Feb. 1990, pp. 348-352.
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