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sensitizer could be increased by repeating the assembly cycle.
For CdSe sensitizer,  the anion source was sodium selenosulfate
(Na2SeSO3) solution, which was prepared by refluxing 0.3 M Se
and 0.6 M Na2SO3 in an ethanol/Milli-Q ultrapure water (3:7)
solution at 70 C for 2 h.

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ÁíThe photoactive semiconductor electrodes were prepared by
successive ionic layer adsorption and reaction (SILAR)
method.29−31 In brief, 0.1 M cadmium nitrate in methanol
was used as cation source and 0.1 M sodium sulfide in 1:1
methanol and water as anion source. To incorporate doping of
Mn2+, manganese acetate (0.075 M) was mixed with cadmium
nitrate. This allowed coadsorption of Mn2+ and Cd2+ ions,
which in turn facilitated incorporation of Mn2+ in the CdS film.
Each cycle of SILAR consists of successive immersion of the
FTO glass electrode, precoated with transparent active TiO2
layer and a scattering layer,14,32 in metal ion and sulfide (or
selenide) anion solutions for 1 min. The cadmium and selenide
ion precursor solution for CdSe was prepared by mixing 0.03 M
cadmium nitrate and 0.03 M selenium oxide, respectively, with
0.06 M sodium borohydride, in degassed ethanol inside a glove
box under N2 atmosphere. All the working electrodes were
finally coated with 2 cycles of ZnS.
The counter electrode was
prepared by doctor blading Cu2S and reduced graphene oxide
(RGO) composite on FTO glass.


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