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Carrier transport in dye-sensitized solar cells using single crystalline TiO<inf>2</inf> nanorods grown by a microwave-assisted hydrothermal reaction

Yang, M and Ding, B and Lee, S and Lee, JK (2011) Carrier transport in dye-sensitized solar cells using single crystalline TiO<inf>2</inf> nanorods grown by a microwave-assisted hydrothermal reaction. Journal of Physical Chemistry C, 115 (30). 14534 - 14541. ISSN 1932-7447

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Abstract

Single crystalline rutile nanorod was grown directly on top of fluorine-doped tin oxide (FTO) substrate via a microwave assisted hydrothermal reaction which dramatically increased a growth rate over a conventional hydrothermal method. In addition, the introduction of thin TiO2 seed layer to FTO substrates promotes heterogeneous nucleation and increases the density. Dye-sensitized solar cells (DSSCs) were fabricated using the rutile nanorods that were differently treated with TiCl4 solution and the carrier transport mechanism in the nanorod-based DSSCs was systematically examined. When the nanorods were treated with TiCl4, more dye was adsorbed on the TiO2 films and the energy conversion efficiency increased to 3.7% for a 2.5 μm thick TiO2 film. Stepped light induced-transient measurement of photocurrent and voltage measurements showed that the role of the nanorods in DSSCs is to increase an electron diffusion coefficient in TiO2 mesoporous films. In contrast to the diffusion coefficient, the lifetime of electron is not dependent on the presence of the nanorods. To explain the experimental observations, we propose a surface diffusion model for electrons that are injected into the rutile nanorods from dye molecules. This surface diffusion may originate from the high crystallinity of nanorods and the homogeneous contact between nanorod and coated nanoparticle layer. © 2011 American Chemical Society.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Yang, M
Ding, B
Lee, S
Lee, JKjul37@pitt.eduJUL370000-0002-7778-7679
Centers: Other Centers, Institutes, Offices, or Units > Petersen Institute of NanoScience and Engineering
Date: 4 August 2011
Date Type: Publication
Journal or Publication Title: Journal of Physical Chemistry C
Volume: 115
Number: 30
Page Range: 14534 - 14541
DOI or Unique Handle: 10.1021/jp2025126
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 1932-7447
Date Deposited: 15 Oct 2014 20:38
Last Modified: 02 Feb 2019 21:55
URI: http://d-scholarship.pitt.edu/id/eprint/23234

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