Size-controlled anatase titania single crystals with octahedron-like morphology for dye-sensitized solar cells

Jia Wei Shiu, Chi Ming Lan, Yu Cheng Chang, Hui Ping Wu, Wei Kai Huang, Wei-Guang Diau*

*Corresponding author for this work

Research output: Contribution to journalArticle

77 Scopus citations

Abstract

A simple hydrothermal method with titanium tetraisopropoxide (TTIP) as a precursor and triethanolamine (TEOA) as a chelating agent enabled growth in the presence of a base (diethylamine, DEA) of anatase titania nanocrystals (HD1-HD5) of controlled size. DEA played a key role to expedite this growth, for which a biphasic crystal growth mechanism is proposed. The produced single crystals of titania show octahedron-like morphology with sizes in a broad range of 30-400 nm; a typical, extra large, octahedral single crystal (HD5) of length 410 nm and width 260 nm was obtained after repeating a sequential hydrothermal treatment using HD3 and then HD4 as a seed crystal. The nanocrystals of size ∼30 nm (HD1) and ∼300 nm (HD5) served as active layer and scattering layer, respectively, to fabricate N719-sensitized solar cells. These HD devices showed greater VOC than devices of conventional nanoparticle (NP) type; the overall device performance of HD attained an efficiency of 10.2% power conversion at a total film thickness of 28 μm, which is superior to that of a NP-based reference device (η = 9.6%) optimized at a total film thickness of 18-20 μm. According to results obtained from transient photoelectric and charge extraction measurements, this superior performance of HD devices relative to their NP counterparts is due to the more rapid electron transport and greater TiO2 potential.

Original languageEnglish
Pages (from-to)10862-10873
Number of pages12
JournalACS Nano
Volume6
Issue number12
DOIs
StatePublished - 21 Dec 2012

Keywords

  • anatase
  • crystal growth
  • dye-sensitized solar cells
  • hydrothermal
  • titania

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