Journal
ELECTRONICS
Volume 12, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/electronics12030758
Keywords
thin film; traps; ultrathin CIGS; PERT silicon; device optimization
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In this study, ultrathin Cu (In1-xGax) Se-2 solar cells were investigated using numerical simulations. The impact of different loss mechanisms, such as interface trap density (D-it) and absorber trap density (N-t), on cell performances were explored. Research found that recombination through traps is the primary loss process in the investigated cells. Additional simulations showed significant performance gains for different cell pitch sizes, absorber doping densities, Ga content, and graded bandgap under AM1.5 illumination. The proposed u-CIGS/PERT silicon device offers insights into the optimization of ultrathin-film CIGS solar cells.
In this paper, we use numerical simulations to investigate ultrathin Cu (In1-xGax) Se-2 solar cells. In the first part, we focus on the cell configuration in which the PV parameters fit and match the fabricated cell characteristics. Our goal is to investigate the impact of different loss mechanisms, such as interface trap density (D-it) and absorber trap density (N-t), in different cell pitch sizes on cell performances. D-it defines the number of carrier traps at CIGS/Al2O3 interfaces to recombine with photogenerated carriers. N-t defines the number of carrier traps in the absorber layer. Recombination through traps has been found to be the primary loss process in the investigated cell. Additional numerical simulations reveal appreciable gains in cell performance for various cell pitch sizes, absorber doping densities, Ga content, and graded bandgap under AM1.5 illumination. Research during the recent decade has clarified that the most promising strategy to achieve maximum efficiency consists of the so-called tandem configuration. Therefore, we here propose a u-CIGS/PERT silicon device employing, as a top cell, a u-CIGS cell optimized to take into account the above procedure. The results of these simulations provide insights into the optimization of ultrathin-film CIGS solar cells.
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