Comparison between Benzothiadizole–Thiophene-and Benzothiadizole–Furan-Based D–A−π–ADyes Applied in Dye-Sensitized Solar Cells: Experimental and TheoreticalInsights
2020
Three
novel donor–acceptor−π–acceptor-type
compounds (WS5, WS6, and WS7) were synthesized and investigated in
dye-sensitized solar cells (DSSCs) exploring the effect of conjugated
linkers on device performance. The new dyes showed strong light-harvesting
ability in the visible region with relatively high molar absorption
coefficients (>21 800 M–1 cm–1). This can be attributed to their intrinsic charge transfer (CT)
from the arylamine to the acceptor group. Density functional theory
(DFT) calculations revealed a favorable lowest unoccupied molecular
orbital (LUMO) energy level, allowing efficient injection into the
semiconductor conduction band after excitation. Upon application in
DSSC devices, the WS5 dye containing 4,7-di(furan-2-yl)benzo[c][1,2,5]thiadiazole as conjugated linker mediated the highest
device power conversion efficiency (PCE) amounting to 5.5%. This is
higher than that of the WS6-containing dye based on the 4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole linker (3.5%) and the WS7 dye based
on the 4-(thiophen-2-yl)benzo[c][1,2,5]thiadiazole
linker (4.3%) under AM 1.5 G illumination. The present results show
furan-based dye linker systems to have a significant potential for
improving DSSC efficiencies.
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