Long Vertically Aligned TiO2 Nanotube Electrodes Prepared via Two-Step Anodization for Highly Efficient Photovoltaics

Title
Long Vertically Aligned TiO2 Nanotube Electrodes Prepared via Two-Step Anodization for Highly Efficient Photovoltaics
Authors
김재엽신준영김동환성영은고민재
Keywords
anodization; dye-sensitized solar cells; electron lifetime; nanotubes; titanium
Issue Date
2015-09
Publisher
Israel journal of chemistry
Citation
VOL 55, NO 9, 1034-1040
Abstract
Vertically aligned long TiO2 nanotube (NT) electrodes with optimized structures for photovoltaic application were prepared by a two-step anodization method. The structures of the conventional TiO2 NT electrodes prepared by one-step anodization became severely bundled and disordered for tube lengths exceeding 20 mm. On the other hand, two-step anodization resulted in uniform and bundle-free TiO2 NT electrodes, with tube lengths of up to 38 mm. When used in dye-sensitized solar cells (DSSCs) as photoanodes, the two-step TiO2 NT electrodes exhibited enhanced shortcircuit current density ( Jsc) with increasing tube length, owing to an increased roughness factor, which resulted in high dye loading. However, the dark current and open-circuit voltage decay (OCVD) curves confirmed that the electron recombination rate increased, and the electron lifetime decreased, with increasing tube length. This reduced electron lifetime resulted in sharp reductions in the open-circuit voltage (Voc) with increasing tube length. Owing to the trade-off between the enhanced current density and the reduced electron lifetime, an optimal conversion efficiency of 4.56% was obtained for a tube length of 29 mm.
URI
http://pubs.kist.re.kr/handle/201004/50286
ISSN
00212148
Appears in Collections:
KIST Publication > Article
Files in This Item:
There are no files associated with this item.
Export
RIS (EndNote)
XLS (Excel)
XML


qrcode

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

BROWSE