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Template‐Directed Liquid ALD Growth of TiO 2 Nanotube Arrays: Properties and Potential in Photovoltaic Devices
Author(s) -
Foong Thelese R. B.,
Shen Yaodong,
Hu Xiao,
Sellinger Alan
Publication year - 2010
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200902063
Subject(s) - materials science , nanoporous , nanotube , atomic layer deposition , nanotechnology , anodizing , indium tin oxide , template , dissolution , chemical engineering , layer (electronics) , carbon nanotube , composite material , aluminium , engineering
Dense and well‐aligned arrays of TiO 2 nanotubes extending from various substrates are successfully fabricated via a new liquid‐phase atomic layer deposition (LALD) in nanoporous anodic alumina (AAO) templates followed by alumina dissolution. The facile and versatile process circumvents the need for vacuum conditions critical in traditional gas‐phase ALD and yet confers ALD‐like deposition rates of 1.6–2.2 Å cycle −1 , rendering smooth conformal nanotube walls that surpass those achievable by sol–gel and Ti‐anodizing techniques. The nanotube dimensions can be tuned, with most robust structures being 150–400 nm tall, 60–70 nm in diameter with 5–20 nm thick walls. The viability of TiO 2 nanotube arrays deposited on indium tin oxide (ITO)–glass electrodes for application in model hybrid poly(3‐hexylthiophene) (P3HT):TiO 2 solar cells is studied. The results achieved provide platforms and research directions for further advancements.