Mesoporous TiO 2 Bragg Stack Templated by Graft Copolymer for Dye-sensitized Solar Cells

Jung Tae Park, Won Seok Chi, Sang Jin Kim, Daeyeon Lee, Jong Hak Kim

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Organized mesoporous TiO 2 Bragg stacks (om-TiO 2 BS) consisting of alternating high and low refractive index organized mesoporous TiO 2 (om-TiO 2) films were prepared to enhance dye loading, light harvesting, electron transport, and electrolyte pore-infiltration in dye-sensitized solar cells (DSSCs). The om-TiO 2 films were synthesized via a sol-gel reaction using amphiphilic graft copolymers consisting of poly(vinyl chloride) backbones and poly(oxyethylene methacrylate) side chains, i.e., PVC-g-POEM as templates. To generate high and low index films, the refractive index of om-TiO 2 film was tuned by controlling the grafting ratio of PVC-g-POEM via atomic transfer radical polymerization (ATRP). A polymerized ionic liquid (PIL)-based DSSC fabricated with a 1.2-μm-thick om-TiO 2 BS-based photoanode exhibited an efficiency of 4.3%, which is much higher than that of conventional DSSCs with a nanocrystalline TiO 2 layer (nc-TiO 2 layer) (1.7%). A PIL-based DSSC with a heterostructured photoanode consisting of 400-nm-thick organized mesoporous TiO 2 interfacial (om-TiO 2 IF) layer, 7-μm-thick nc-TiO 2, and 1.2-μm-thick om-TiO 2 BS as the bottom, middle and top layers, respectively, exhibited an excellent efficiency of 7.5%, which is much higher than that of nanocrystaline TiO 2 photoanode (3.5%).

Original languageEnglish
Article number5505
JournalScientific reports
Volume4
DOIs
Publication statusPublished - 2014 Jul 1

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Graft copolymers
Ionic Liquids
Refractive index
Vinyl Chloride
Methacrylates
Free radical polymerization
Infiltration
Electrolytes
Sol-gels
Coloring Agents
Dye-sensitized solar cells
poly(vinyl chloride)-g-poly(oxyethylene methacrylate)

All Science Journal Classification (ASJC) codes

  • General

Cite this

Park, Jung Tae ; Chi, Won Seok ; Kim, Sang Jin ; Lee, Daeyeon ; Kim, Jong Hak. / Mesoporous TiO 2 Bragg Stack Templated by Graft Copolymer for Dye-sensitized Solar Cells. In: Scientific reports. 2014 ; Vol. 4.
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abstract = "Organized mesoporous TiO 2 Bragg stacks (om-TiO 2 BS) consisting of alternating high and low refractive index organized mesoporous TiO 2 (om-TiO 2) films were prepared to enhance dye loading, light harvesting, electron transport, and electrolyte pore-infiltration in dye-sensitized solar cells (DSSCs). The om-TiO 2 films were synthesized via a sol-gel reaction using amphiphilic graft copolymers consisting of poly(vinyl chloride) backbones and poly(oxyethylene methacrylate) side chains, i.e., PVC-g-POEM as templates. To generate high and low index films, the refractive index of om-TiO 2 film was tuned by controlling the grafting ratio of PVC-g-POEM via atomic transfer radical polymerization (ATRP). A polymerized ionic liquid (PIL)-based DSSC fabricated with a 1.2-μm-thick om-TiO 2 BS-based photoanode exhibited an efficiency of 4.3{\%}, which is much higher than that of conventional DSSCs with a nanocrystalline TiO 2 layer (nc-TiO 2 layer) (1.7{\%}). A PIL-based DSSC with a heterostructured photoanode consisting of 400-nm-thick organized mesoporous TiO 2 interfacial (om-TiO 2 IF) layer, 7-μm-thick nc-TiO 2, and 1.2-μm-thick om-TiO 2 BS as the bottom, middle and top layers, respectively, exhibited an excellent efficiency of 7.5{\%}, which is much higher than that of nanocrystaline TiO 2 photoanode (3.5{\%}).",
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Mesoporous TiO 2 Bragg Stack Templated by Graft Copolymer for Dye-sensitized Solar Cells. / Park, Jung Tae; Chi, Won Seok; Kim, Sang Jin; Lee, Daeyeon; Kim, Jong Hak.

In: Scientific reports, Vol. 4, 5505, 01.07.2014.

Research output: Contribution to journalArticle

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