Abstract
Hierarchically structured TiO 2 (HS-TiO 2) was prepared on a flexible ITO-PEN (polyethylene naphthalate) substrate via electrospray deposition using a commercially available TiO 2 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-TiO 2; however, this treatment improved the interparticle connectivity and physical adhesion between the HS-TiO 2 and ITO-PEN substrate, which increased the photocurrent density of the as-pressed HS-TiO 2 cells. The electron diffusion coefficients of the as-pressed HS-TiO 2 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 TiO 2 submitted to TTB hydrolysis in water at 100 °C yielded an anatase phase. TTB treatment of the HS-TiO 2 cell after compression treatment yielded faster electron diffusion, providing an efficiency of 5.57% under 100 mW cm -2, AM 1.5 global illumination.
| Original language | English |
|---|---|
| Pages (from-to) | 3308-3315 |
| Number of pages | 8 |
| Journal | ACS Applied Materials and Interfaces |
| Volume | 4 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2012 Jun 27 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
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Low-temperature fabrication of TiO 2 electrodes for flexible dye-sensitized solar cells using an electrospray process. / Lee, Horim; Hwang, Daesub; Jo, Seong Mu; Kim, Dongho; Seo, Yongsok; Kim, Dong Young.
In: ACS Applied Materials and Interfaces, Vol. 4, No. 6, 27.06.2012, p. 3308-3315.Research output: Contribution to journal › Article
TY - JOUR
T1 - Low-temperature fabrication of TiO 2 electrodes for flexible dye-sensitized solar cells using an electrospray process
AU - Lee, Horim
AU - Hwang, Daesub
AU - Jo, Seong Mu
AU - Kim, Dongho
AU - Seo, Yongsok
AU - Kim, Dong Young
PY - 2012/6/27
Y1 - 2012/6/27
N2 - Hierarchically structured TiO 2 (HS-TiO 2) was prepared on a flexible ITO-PEN (polyethylene naphthalate) substrate via electrospray deposition using a commercially available TiO 2 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-TiO 2; however, this treatment improved the interparticle connectivity and physical adhesion between the HS-TiO 2 and ITO-PEN substrate, which increased the photocurrent density of the as-pressed HS-TiO 2 cells. The electron diffusion coefficients of the as-pressed HS-TiO 2 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 TiO 2 submitted to TTB hydrolysis in water at 100 °C yielded an anatase phase. TTB treatment of the HS-TiO 2 cell after compression treatment yielded faster electron diffusion, providing an efficiency of 5.57% under 100 mW cm -2, AM 1.5 global illumination.
AB - Hierarchically structured TiO 2 (HS-TiO 2) was prepared on a flexible ITO-PEN (polyethylene naphthalate) substrate via electrospray deposition using a commercially available TiO 2 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-TiO 2; however, this treatment improved the interparticle connectivity and physical adhesion between the HS-TiO 2 and ITO-PEN substrate, which increased the photocurrent density of the as-pressed HS-TiO 2 cells. The electron diffusion coefficients of the as-pressed HS-TiO 2 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 TiO 2 submitted to TTB hydrolysis in water at 100 °C yielded an anatase phase. TTB treatment of the HS-TiO 2 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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U2 - 10.1021/am3007164
DO - 10.1021/am3007164
M3 - Article
VL - 4
SP - 3308
EP - 3315
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 6
ER -