Low-temperature fabrication of TiO2 electrodes for flexible dye-sensitized solar cells using an electrospray process
- Low-temperature fabrication of TiO2 electrodes for flexible dye-sensitized solar cells using an electrospray process
- 이호림; 황대섭; 조성무; 김동호; 서용석; 김동영
- electrospray; hierachical structured TiO2; flexible dye sensitized solar cells; low temperature process; compression treatment; chemical sintering
- Issue Date
- ACS Applied Materials & Interfaces
- VOL 4, NO 6, 3308-3315
- Hierarchically structured TiO2 (HS-TiO2) was prepared on a flexible ITO-PEN (polyethylene naphthalate) substrate via electrospray deposition using a commercially available TiO2 nanocrystalline powder in order to fabricate flexible DSSCs under low-temperature (<150 °C) conditions. The cell efficiency increased when using flexible ITO-PEN substrates post-treated by either a mechanical compression treatment or a chemical sintering treatment using titanium n-tetrabutoxide (TTB). The mechanical compression treatment reduced the surface area and porosity of the HS-TiO2; however, this treatment improved the interparticle connectivity and physical adhesion between the HS-TiO2 and ITO-PEN substrate, which increased the photocurrent density of the as-pressed HS-TiO2 cells. The electron diffusion coefficients of the as-pressed HS-TiO2 improved upon compression treatment, whereas the recombination lifetimes remained unchanged. An additional chemical sintering post-treatment involving TTB was tested for its effects on DSSC efficiency. The freshly coated TiO2 submitted to TTB hydrolysis in water at 100 °C yielded an anatase phase. TTB treatment of the HS-TiO2 cell after compression treatment yielded faster electron diffusion, providing an efficiency of 5.57% under 100 mW cm–2, AM 1.5 global illumination.
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