TITLE:
Back Illuminated N/P/P+ Bifacial Silicon Solar Cell under Modulated Short-Wavelength: Determination of Base Optimum Thickness
AUTHORS:
Mamadou Sall, Dianguina Diarisso, Mame Faty Mbaye Fall, Gora Diop, Mor Ndiaye, Khady Loum, Gregoire Sissoko
KEYWORDS:
Bifacial Silicon Solar Cell, AC Recombination Velocity-Base Thickness, Short-Wavelength
JOURNAL NAME:
Energy and Power Engineering,
Vol.13 No.5,
May
31,
2021
ABSTRACT: A bifacial silicon solar cell under monochromatic illumination in
frequency modulation by the rear side is being studied for the optimization of
base thickness. The density of photogenerated carriers in the base is obtained
by resolution of the continuity equation, with the help of boundary conditions
at the junction surface (n+/p) and the rear face (p/p+)
of the base. For a short wavelength corresponding to a high absorption
coefficient, the AC photocurrent density is calculated and represented
according to the excess minority carrier’s recombination velocity at the
junction, for different modulation frequency values. The expression of the AC
recombination velocity of excess minority carriers at the rear surface of the
base of the solar cell is then deduced, depending on both, the absorption
coefficient of the silicon material and the thickness of the base. Compared to
the intrinsic AC recombination velocity, the optimal thickness is extracted and
modeled in a mathematical relationship, as a decreasing function of the modulated frequency of back
illumination. Thus under these operating conditions, a maximum short-circuit photocurrent is obtained
and a low-cost
bifacial solar cell can be achieved by reducing material (Si) to elaborate the
base thickness.