A New Type of Electrolyte with a Light-Trapping Scheme for High-Efficiency Quasi-Solid-State DSSC.pdfVIP
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A New Type of Electrolyte with a Light-Trapping Scheme for High-Efficiency Quasi-Solid-State DSSC
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www.advmat.de
www.MaterialsV
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High-Effi ciency Quasi-Solid-State Dye-Sensitized Solar Cells By Meng Wang, Xu Pan,* Xiaqin Fang, Lei Guo, Weiqing Liu, Changneng Zhang,
Yang Huang, Linhua Hu, and Songyuan Dai* Dye-sensitized solar cells (DSSCs) are attracting both aca-
demic and industrial interest owing to their high-effi ciency
and potential low-cost. [ 1 ] The electrolyte, containing the
I ? /I 3 ? redox couple, is the one of the most-important com-
ponents of a DSSC, and directly infl uences their perform-
ance and stability. [ 2,3 ] Generally, the role of the electrolyte in
a DSSC is to fi nish the charge cycle, including the transport
of the I ? /I 3 ? redox couple, [ 4 ] the regeneration of oxidized
dye at the dyed TiO 2 /electrolyte interface and the reduction
of I 3 ? at the counter electrode. [ 5 ] However, I 3 ? in the electro-
lyte will absorb visible light, [ 6 ] which results in energy loss.
Furthermore, due to the inhomogeneous dye distribution, [ 7 ]
a certain part of the incident light transmits through the
photoanode, which decreases the light-harvesting effi ciency.
As we know, although relatively large particles have already
been used in DSSCs to help increase the light-harvesting effi -
ciency, still part of the incident light will transmit through the
photoanode. Moreover. an excess of large particles will not
only lower the light-harvesting effi ciency over the whole range
of visible wavelengths owing to enhanced light refl ection at
the conducting glass/TiO 2 interface, but also decrease the
electron-transfer yield. [ 8 ]
As reported previously, [ 9 ] light trapping has become a
standard technique to increase the light absorption of incident
light in the active layers of hydrogenated amorphous-silicon-
based solar cells, based on the use of textured substrates and
highly refl ective back contacts. This triggered our inte
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