  An asymmetric A-{\pi}-D-{\pi}-D-{\pi}-A' tribranched organic dye (dye1) with
a cyanoacrylic acid and an indolinum carboxyl acid as electron acceptors and a
triphenylamine as an electron donor was designed and theoretically investigated
for dye-sensitized solar cells (DSSCs). Dye1 was compared to reference
well-known dyes with single electron acceptors (D5 and JYL-SQ6). Density
functional theory and time-dependent density functional theory calculations
were used to estimate the photovoltaic properties of the dyes. Due to the
different lowest unoccupied molecular orbital levels of each acceptor and the
energy antenna of the dual electron donor (D-{\pi}-D), the absorption spectrum
of each branch displayed different shapes. Considering the overall properties,
the asymmetric A-{\pi}-D-{\pi}-D-{\pi}-A' tribranched organic dye exhibited
high conversion efficiency performance for DSSCs. The findings of this work
suggest that optimizing the branch of electron donors and acceptors in dye
sensitizers based on asymmetric A-{\pi}-D-{\pi}-D-{\pi}-A' tribranched organic
dye produces good photovoltaic properties for DSSCs.
