Poriferous microtablet of anatase TiO2 growth on an ITO surface for high-efficiency dye-sensitized solar cells

Ali Umar Akrajas, Suratun Nafisah, Siti Khatijah Md Saad, Sin Tee Tan, Aamna Balouch, Muhamad Mat Salleh, Munetaka Oyama

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

A liquid-phase deposition method enables the synthesis of a unique anatase TiO2 structure, which consists of poriferous microtablets with a hairy nanowire skin and a body constructed by a brick-like assembly of nanocuboids, directly onto an ITO substrate. The poriferous TiO2 microtablets (PTM) have square-shaped, rounded vertices, edges that are 10 μm in length and a thickness of approximately 5 μm. They can be grown at a high density onto an ITO surface from a growth solution that contains ammonium hexafluoro titanate and boric acid. The nanowires that decorate the PTM surface have a diameter of 10 nm and a length of approximately 200 nm. Its bulk structure is constructed from a brick-like assembly of nanocuboids with a width, length and thickness of approximately 10, 20 and 5 nm, respectively. The driving factor for the formation of this structure is oriented attachment under kinetic control. The preliminary results of the application of this structure in dye-sensitized solar cell (DSSC) devices indicate a power conversion efficiency as high as 3.0%. Because the active surface area in the PTM is large enough for dye adsorption (for a typical dye loading as high as approximately 936 nmol/cm2) and surface reactions, a high-efficiency DSSC device may be achievable using this new structure if the optimum conditions are obtained.

Original languageEnglish
Pages (from-to)174-182
Number of pages9
JournalSolar Energy Materials and Solar Cells
Volume122
DOIs
Publication statusPublished - Mar 2014

Fingerprint

Titanium dioxide
Brick
Nanowires
Coloring Agents
Dyes
Boric acid
Surface reactions
Ammonium Compounds
Conversion efficiency
Skin
Adsorption
Kinetics
Liquids
Substrates
Dye-sensitized solar cells
titanium dioxide
boric acid

Keywords

  • Anatase TiO
  • Dye-loading
  • Microtablet
  • Poriferous
  • Solar cell

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films

Cite this

Poriferous microtablet of anatase TiO2 growth on an ITO surface for high-efficiency dye-sensitized solar cells. / Akrajas, Ali Umar; Nafisah, Suratun; Md Saad, Siti Khatijah; Tee Tan, Sin; Balouch, Aamna; Mat Salleh, Muhamad; Oyama, Munetaka.

In: Solar Energy Materials and Solar Cells, Vol. 122, 03.2014, p. 174-182.

Research output: Contribution to journalArticle

Akrajas, Ali Umar ; Nafisah, Suratun ; Md Saad, Siti Khatijah ; Tee Tan, Sin ; Balouch, Aamna ; Mat Salleh, Muhamad ; Oyama, Munetaka. / Poriferous microtablet of anatase TiO2 growth on an ITO surface for high-efficiency dye-sensitized solar cells. In: Solar Energy Materials and Solar Cells. 2014 ; Vol. 122. pp. 174-182.
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