Abstract
Sb2S3 nanostructures of orthorhombic phase are synthesized by a facile microwave irradiation technique by optimizing the morphology. These are employed as the infrared photon absorber of the solar spectrum, and J-V results confirm that Poly Vinyl Pyrrolidone (PVP) and citric treated Sb2S3 nanowires/nanorods deliver the highest JSC of ~3.45 mA/cm2, η of ~0.48% and 3.22 mA/cm2, η of ~0.35% respectively. The samples are employed as the counter electrode under TiO2/N719/(I-/I3-), and among all, PVP treated Sb2S3 yield the highest JSC of ~11.2 mA/cm2 and η of ~4.6%. This enhancement in Power Conversion Efficiency (PCE) is analyzed by impedance spectroscopy. Apart from photon-absorbing property, cyclic voltammetry measurements reveal that Sb2S3 acquire better electrocatalytic activity and charge-transfer ability under I3-/I- and polysulfide medium. This superior electrocatalytic activity will be useful in the design of symmetric solar cells in the future where this nanostructure can act as a sensitizer as well as counter electrode in a single cell.
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