Improved Efficiency of Dye‐Sensitized Solar Cells Based on a Single Layer Deposition of Skein‐Like TiO₂ Nanotubes

Abstract

We present a new TiO 2 morphology, featuring high surface area and open structure, synthesized by a two-step chemical route for the manufacture of dye-sensitized solar cells (DSSCs). This construct is sets of intertwined one-dimensional (1D) nanostructures (i.e., nanotubes), so-called skein-like nanotubes (NTs). Such morphology is produced by a combination of TiC oxidation and hydrothermal processes. The mesoporous TiO 2 nanoparticles, as the product of TiC oxidation operation, is used as the precursor of hydrothermal process to grow the skein-like NTs. The effect of processing parameters of TiC oxidation and hydrothermal processes is studied. The skein-like morphology enables to eliminate the conventional three or fourfold layer deposition process by a single layer deposition of TiO 2 NTs. The novel TiO 2 morphology enhances photon capture of fabricated DSSC by exerting a triple function mechanism including improvement of light scattering, dye sensitization, and electron transport. The presented strategy demonstrates the feasibility of the new concept for improvement of cell efficiency by effective light management.

Promoting Effect of TiCl4 Pre-Coating Time on TiO2 Semiconductors on Double Layer Dye-Sensitized Solar Cell

“…To maintain superior electrical conductivity and avoid electron and hole recombination, a large surface area, strong connections between the TiO2 particles, and adequate adhesion between the TiO2 layer and the TCO coated glass are essential [26,27]. To demonstrate that this construct may operate as an active layer and scatter simultaneously to boost dye sensitization, electron transport rate, and ultimately cell efficiency, it is necessary to optimize the shape of the TiO2 layer in accordance with the aforementioned parameters [28].…”

Effect of TiO2 Compact Layer on DSSC Performance

“…Figure 5 shows the SEM micrograph of TiO2 nanotube film. SEM analysis revealed that TiO2 nanotubes had a skein-like morphology with abundant number of nanotubes intertwined together such that their surface area is considerably large [9]. For better I-V performance of the solar cell, the nanotubes' number need to be high so as to have maximum dye adsorption which would translate to efficient light harvesting.…”