Sayantan Biswas, Ashim Kumar Biswas, Amitabha Sinha

The effect of front and rear surface recombination velocities on the photocurrent of a buried emitter silicon solar cell

Analytical work on the buried emitter solar cell (BESC) has been carried out based on the model presented previously by various researchers. The minority carrier distribution and the photocurrent contribution from the front region and also the rear region of the cell have been studied, taking into consideration the effects of front surface and rear surface recombination velocities. It is observed from these theoretical studies that reducing these recombination velocities, there is significant improvement in the photocurrent contributions form these regions. This emphasizes the role of a back surface field (BSF) in such devices. It may be mentioned here that in some recent experimental studies on new types of BESC solar cells, heavily doped BSF regions have been included by investigators.

Keywords:

Buried emitter silicon solar cell; surface recombination velocity; photocurrent; minority carrier concentration,

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D.M. Chapin, C.S. Fuller and G.L. Pearson, “A new silicon p-n junction photocell for converting solar radiation into electrical power”, J. Appl. Phys., vol. 25, pp. 676-677, May 1954.
M.B. Prince, “Silicon solar energy converters”, J. Appl. Phys.,vol. 26, pp. 534-540, May 1955.
W. Shockley and H.J.Queisser, “Detailed balance limit of efficiency of p-n junction solar cell”, J. Appl. Phys., vol. 32, pp. 510-519, 1961.
M.Wolf, “A new look at silicon solar cell performance”, Energy Conversion, vol. 11, pp. 63-73, 1971.
A.W. Blakers and M.A. Green,“20% efficiency silicon solar cells”,Appl. Phys. Lett.,vol. 48,pp. 215-217, Jan 1986.
W. Wang, J. Zhao and M.A. Green, “24% efficiency silicon solar cells”, Appl. Phys. Lett. , vol.57, pp. 602-604, August 1990.
A.S. Bouazzi, M.Abaab and B.Rezig, “A new model of very high efficiency buried emitter silicon solar cell”, Solar Energy Materials and Solar Cells, vol. 46, pp. 29-41, 1997.
N.-P. Harder, V. Mertens and R.Brendel, “Buried emitter solar cell structures: Decoupling of metallization geometry and carrier collection geometry of back contacted solar cells”, Phys. stat. sol. (RRL), vol. 2, No. 4, pp. 148-150, 2008.
V. Mertens, S. Bordihn, Y. Larionova, N.-P. Harder and R. Brendel, “The buried emittersolar cell concept: Interdigitated Back Junction Structure with virtually 100% emitter coverage of the cell area”, 24th European Photovoltaic Solar Energy Conference, Hamburg, Germany, Sept. 2009.
Nils –P. Harder, V. Mertens and R. Brendel, “Numerical simulations of buried emitter back junction solar cells”, Prog. Photovolt: Res. Appl., vol. 17, pp.253-263, 2009.