Detachment and transfer of ordered TiO 2 nanotube arrays for front-illuminated dye-sensitized solar cells

Lu Lin Li, Yi Ju Chen, Hui Ping Wu, Niann-Shiah Wang, Wei-Guang Diau*

*Corresponding author for this work

Research output: Contribution to journalArticle

74 Scopus citations

Abstract

We report a method of detachment and transfer of one-dimensional TiO 2 nanotube (NT) arrays to fabricate dye-sensitized solar cells (DSSCs) with illumination from the front side. The ordered NT arrays (tube length 20 μm) were detached from the NT-Ti substrate, as annealed, by means of a second anodization at 20 V for 4 h and then transferred, inverted, onto a transparent substrate of conducting oxide (TCO) with an interface of TiO 2 nanoparticles of thickness ∼2 μm. Dry etching of the NT surface in a highly dense plasma reactor under BCl 3/Cl 2 for 90 s opened previously closed ends of the tubes. The inverted (bottom-up) NT-TCO substrate was fabricated into a DSSC device that shows a cell performance (η = 6.24%) significantly improved over those of a front-illuminated counterpart with an upright (face-up) structure (η = 4.84%) and of a conventional back-illuminated device (η = 4.61%). Electrochemical impedance spectra (EIS) of the devices under one-sun irradiation were measured to rationalize the cell performances that are consistent with the corresponding interfacial impedances between the NT arrays and the electrode for collection of electrons.

Original languageEnglish
Pages (from-to)3420-3425
Number of pages6
JournalEnergy and Environmental Science
Volume4
Issue number9
DOIs
StatePublished - 1 Sep 2011

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