Fig. 1 Schematic device structure of quantum dotsensitized solar cells employing a TiO2 nanotube electrode with a semitransparent Pt counter electrode.
Fig. 2 SEM images of the surface of (a) one-step anodic oxidized TiO2 nanotube electrode, (b) pre-treated Ti substrate, and (c) two-step anodic oxidized TiO2 nanotube electrode. (d) Cross-sectional SEM image of two-step anodic oxidized TiO2 nanotube electrode.
Fig. 4 Surface SEM images of (a) bare FTO glass and (b) Pt-coated FTO glass.
Fig. 3 (a) Photographs of the Pt precursor solutions and Pt-coated FTO glasses according to the concentration of Pt precursor solution. (b) Specular transmittance of Pt-coated FTO glasses according to the concentration of Pt precursor solution.
Fig. 5 (a) electrochemical impedance spectra and (b) photocurrent density-voltage (J-V) characteristics of Pt counter electrodes according to the concentration of Pt precursor solution. The inset in (a) shows the equivalent circuit model.
Table 1. Summary of J-V characteristics for quantum dot-sensitized solar cells with Pt counter electrodes according to the concentration of Pt precursor solution.
References
-
G. K. Mor, K. Shankar, M. Paulose, O. K. Varghese and C. A. Grimes, Use of Highly-Ordered
$TiO_2$ Nanotube Arrays in Dye-Sensitized Solar Cells, Nano Lett., 6 (2006) 215. https://doi.org/10.1021/nl052099j -
K. Zhu, N. R. Neale, A. Miedaner and A. J. Frank, Enhanced Charge-Collection Efficiencies and Light Scattering in Dye-Sensitized Solar Cells Using Oriented
$TiO_2$ Nanotubes Arrays, Nano Lett., 7 (2007) 69. https://doi.org/10.1021/nl062000o -
J.-Y. Kim, K. J. Lee, S. H. Kang, J. Shin and Y.-E. Sung, Enhanced Photovoltaic Properties of a Cobalt Bipyridyl Redox Electrolyte in Dye- Sensitized Solar Cells Employing Vertically Aligned
$TiO_2$ Nanotube Electrodes, J. Phys. Chem. C, 115 (2011) 19979. https://doi.org/10.1021/jp2025736 -
J.-Y. Kim, J. S. Kang, J. Shin, J. Kim, S.-J. Han, J. Park, Y.-S. Min, M. J. Ko and Y.-E. Sung, Highly Uniform and Vertically Aligned
$SiO_2$ Nanochannel Arrays for Photovoltaic Applications, Nanoscale, 7 (2015) 8368. https://doi.org/10.1039/C5NR00202H - J.-Y. Kim, J. Yang, J.H. Yu, W. Baek, C.-H. Lee, H.J. Son, T. Hyeon and M.J. Ko, Highly Efficient Copper-Indium-Selenide Quantum Dot Solar Cells: Suppression of Carrier Recombination by Controlled ZnS Overlayers, ACS Nano, 9 (2015) 11286. https://doi.org/10.1021/acsnano.5b04917
- P. V. Kamat, Quantum Dot Solar Cells. The Next Big Thing in Photovoltaics, J. Phys. Chem. Lett., 4 (2013) 908. https://doi.org/10.1021/jz400052e
- A. J. Nozik, M.C. Beard, J.M. Luther, M. Law, R.J. Ellingson and J.C. Johnson, Semiconductor Quantum Dots and Quantum Dot Arrays and Applications of Multiple Exciton Generation to Third-Generation Photovoltaic Solar Cells, Chem. Rev., 110 (2010) 6873. https://doi.org/10.1021/cr900289f