Abstract
Surface recombination has a profound effect on the performance of a solar cell, at the illuminated surface reduces its photocurrent and along the cell's perimeter increases its dark current. The perimeter recombination current has two components; the first is due to recombination at the surface that intersects the space-charge layer while the second originates from recombination at the surface of quasi-neutral regions. The current due to recombination at the depleted layer surface is treated in a similar way to that of the bulk, using a simple model. We present an analytical form that produces results that agree well with reported experimental findings. The recombination current outside the space-charge region is of two-dimensional nature, it represents lateral diffusion of minority carriers from the boundary of the depleted layer to the perimeter. This current is calculated by solving numerically a two-dimensional continuity equation. As the ratio of perimeter to area is increased the perimeter current acquires important proportions, consequently the expected bulk recombination current becomes insignificant.
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Ohsawa, J., Kawasaki, M., Tanaka, T., et al.: A GaAs micro solar cell with output voltage over 20 V. Jpn., J. Appl. Phys. 38, 6947 (1999)
Aberle, A.G., Altermatt, P.P., Heiser, G., et al.: Limiting loss mechanisms in 23% efficient silicon solar cells. J. Appl. Phys. 77(7), 3491 (1995)
Mazhari, B., Morkoç, H.: Surface recombination in GaAs PN junction diode. J. Appl. Phys. 73(11), 7509 (1993)
Belghachi, A.: Modelling of perimeter recombination in GaAs solar cells. Microelectron. J. 36, 115 (2005)
Tobin, S.P., Vernon, S.M., Bajgar, C., et al.: Assessment of MOCVD and MBE- grown GaAs for high-efficiency solar cell applications. IEEE Transactions on Electron Devices 37(2), 469 (1990)
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Belghachi, A. Perimeter recombination in thin film solar cells. J Comput Electron 6, 279–283 (2007). https://doi.org/10.1007/s10825-006-0123-5
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DOI: https://doi.org/10.1007/s10825-006-0123-5