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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 32, Number 11
BKCSDE 32(11)
November 20, 2011 

Photovoltaic Behavior of Dye-sensitized Long TiO2 Nanotube Arrays
Sang Mo Kim, Hark Jin Kim, Yong Joo Kim, Gooil Lim, Young Sik Choi, Wan In Lee *
Dye-sensitized solar cells (DSC), TiO2 nanotube arrays, Anodization, Electron diffusion, Photovoltaic conversion efficiency
Long TiO2 nanotube (NT) arrays, prepared by electrochemical anodization of Ti foils, have been utilized as dye-adsorbing electrodes in dye-sensitized solar cells (DSCs). By anodizing for 1-24 hr and subsequent annealing, highly crystallized and tightly-adhered NT arrays were tailored to 11-150 μm lengths, ~90 nm innerpore diameter and ~30 nm wall thickness. I-V curves revealed that the photovoltaic conversion efficiency (η) was proportional to the NT length up to 36 μm. Beyond this length, the η was still steadily increased, though at a much lower rate. For example, an η of 5.05% at 36 μm was increased to 6.18% at 150 μm. Transient photoelectron spectroscopic analyses indicated that NT array-based DSCs revealed considerably higher electron diffusion coefficient (De) and life time (τe) than those with TiO2 nanoparticles (NP). Moreover, the electron diffusion lengths (Le) of the photo-injected electrons were considerably larger than the corresponding NT lengths in all the cases, suggesting that electron transport in NT arrays is highly efficient, regardless of tube length.
4035 - 4040
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