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2017 ; 7
(1
): 1766
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Band Gap Engineering of Multi-Junction Solar Cells: Effects of Series Resistances
and Solar Concentration
#MMPMID28496120
Zeitouny J
; Katz EA
; Dollet A
; Vossier A
Sci Rep
2017[May]; 7
(1
): 1766
PMID28496120
show ga
Multi-junction (MJ) solar cells are one of the most promising technologies
achieving high sunlight to electricity conversion efficiency. Resistive losses
constitute one of the main underlying mechanisms limiting their efficiency under
high illumination. In this paper, we study, by numerical modeling, the extent to
which a fine-tuning of the different electronic gaps involved in MJ stacks may
mitigate the detrimental effects of series resistance losses for
concentration-dependent and independent series resistances. Our results
demonstrate that appropriate bandgap engineering may lead to significantly higher
conversion efficiency at illumination levels above ~1000 suns and series
resistance values typically exceeding 0.02?? cm(2), due to lower operating
current and, in turn, series resistance losses. The implications for future
generations of solar cells aiming at an improved conversion of the solar spectrum
are also addressed.