Up-conversion in perovskite strontium stannate nanocrystals for application in dye-sensitized solar cellTuesday (27.09.2016) 12:00 - 12:03 Part of:
The light to electricity conversion efficiency of dye sensitized solar cells (DSSCs) is not only decided by the dye molecules, semiconducting material and redox shuttle selection, but also depends on particle size and size distribution of the semiconducting photo-anode. In this work, a simple, eco-friendly facile wet chemical nitrate precursor route for the synthesis of pristine and alkaline earth metal co-doped (Er and Yb in ratio 10/90,15/85 and 20/80) nano-crystalline (~ 15-25 nm) SrSnO3, which is room temperature n-type wide band gap (~ 4.1 eV) orthorhombic pervoskite semiconductor, has been utilized. The obtained rare earth alkaline doped materials have been used as up-conversion semiconductor photo-anode in DSSC. The particle sizes of synthesized nanostructures were estimated to be in the range of 15-25 nm. The increment in band gap of SrSnO3 was observed with the increase in Er and Yb content (from 4.1 to 4.23eV, 4.30 ev and 4.39 eV). The perovskite SrSnO3 samples exhibited strong emission around 365 nm following band–gap excitation by 290 nm. The resistivity values decreased with increase in the dopants Er and Yb concentration due to enhancement in charge carrier concentration. The DSSC device has been successfully fabricated and tested for its impedance and current voltage (I-V) behavior.