Improved Quantum Efficiency of Highly Efficient Perovskite BaSnO3-Based Dye-Sensitized Solar Cells
- Improved Quantum Efficiency of Highly Efficient Perovskite BaSnO3-Based Dye-Sensitized Solar Cells
- Seong Sik Shin; Ju Seong Kim; Jae Ho Suk; 이기두; Dong Wook Kim; Jong Hoon Park; In Sun Cho; Kug Sun Hong; 김진영
- DSSC; BaSnO3; Perovskite; IMPS; IMVS; electron dynamics; TiCl4; barium stannate; dye-sensitized solar cell; quantum efficiency
- Issue Date
- ACS Nano
- VOL 7, NO 2, 1027-1035
- Ternary oxides are potential candidates as an electrontransporting
material that can replace TiO2 in dye-sensitized solar cells
(DSSCs), as their electronic/optical properties can be easily controlled by
manipulating the composition and/or by doping. Here, we report a new
highly efficient DSSC using perovskite BaSnO3 (BSO) nanoparticles. In
addition, the effects of a TiCl4 treatment on the physical, chemical, and
photovoltaic properties of the BSO-based DSSCs are investigated. The TiCl4
treatment was found to form an ultrathin TiO2 layer on the BSO surface, the
thickness of which increases with the treatment time. The formation of the
TiO2 shell layer improved the charge-collection efficiency by enhancing the charge transport and suppressing the charge recombination. It was also found
that the TiCl4 treatment significantly reduces the amount of surface OH species, resulting in reduced dye adsorption and reduced light-harvesting efficiency.
The trade-off effect between the charge-collection and light-harvesting efficiencies resulted in the highest quantum efficiency (i.e., short-circuit
photocurrent density), leading to the highest conversion efficiency of 5.5% after a TiCl4 treatment of 3 min (cf. 4.5% for bare BSO). The conversion efficiency
could be increased further to 6.2% by increasing the thickness of the BSO film, which is one of the highest efficiencies from non-TiO2-based DSSCs.
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