One-step process for the synthesis and deposition of anatase, two-dimensional, disk-shaped TiO2 for dye-sensitized solar cells

Chang Soo Lee, Jin Kyu Kim, Jung Yup Lim, Jong Hak Kim

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

We report a one-step process for the synthesis and deposition of anatase, two-dimensional (2D), disk-shaped TiO2 (DS-TiO2) using titanium isopropoxide (TTIP), ethyl cellulose (EC), and solvents. The planar structure of EC plays a pivotal role as the sacrificing template to generate the 2D disk-shaped structure with a thickness of 1.5-3.5 μm, while a disk-like structure was well developed in the tetrahydrofuran (THF)/toluene mixed solvent. The quasi-solid-state dye-sensitized solar cells (qssDSSCs), fabricated with a nanogel electrolyte and a DS-TiO2 layer on a nanocrystalline (NC)-TiO2 photoanode, showed an energy conversion efficiency of 5.0% without any TiCl4 post-treatment, which is higher than that fabricated without DS-TiO2 (4.2%). When utilizing a poly((1-(4-ethenylphenyl)methyl)-3-butyl-imidazolium iodide) (PEBII) as the solid electrolyte, a high efficiency of 6.6% was achieved due to the combination of high mobility PEBII and a bifunctional DS-TiO2 layer with a 2D structure and anatase phase. The bifunctionality of the DS-TiO2 layer allows greater light scattering back into the device and provides additional surface area for improved dye adsorption, resulting in short circuit current density (Jsc).

Original languageEnglish
Pages (from-to)20842-20850
Number of pages9
JournalACS Applied Materials and Interfaces
Volume6
Issue number23
DOIs
Publication statusPublished - 2014 Dec 10

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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