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Two-step sol-gel method-based TiO<inf>2</inf> nanoparticles with uniform morphology and size for efficient photo-energy conversion devices

Lee, S and Cho, IS and Lee, JH and Kim, DH and Kim, DW and Kim, JY and Shin, H and Lee, JK and Jung, HS and Park, NG and Kim, K and Ko, MJ and Hong, KS (2010) Two-step sol-gel method-based TiO<inf>2</inf> nanoparticles with uniform morphology and size for efficient photo-energy conversion devices. Chemistry of Materials, 22 (6). 1958 - 1965. ISSN 0897-4756

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The performance of dye-sensitized solar cells (DSSCs) consisting of anatase TiO2 nanoparticles that were synthesized via a two-step sol-gel process was investigated using electron transport and optical characterizations. Spherical nanoparticles with the average diameter of 20 nm, elongated nanorods with an aspect ratio (AR) of 5, and nanowires with AR = 10 were synthesized. The synthesized nanoparticles possess narrow size distribution, high crystallinity, and negligible surface defects and residual organics, which is very suitable for achieving highly efficient photovoltaic devices. The effect of particle size distribution on the performance of DSSC was characterized by comparing the synthesized TiO2 nanoparticles and commercial TiO2 nanoparticles (P25). In comparison with P25, the two-step sol-gel-grown nanoparticles significantly improved the photovoltaic conversion efficiency by 32.5%, because of a larger specific surface area, higher electrolyte penetration ability, and lower optical reflectance. Therefore, the photoelectrode of the two-step sol-gel-derived TiO2 nanoparticles enhanced the adsorption of dye sensitizers (N719), promotes the transfer of photogenerated carriers, and decreases the ratio of reflected solar spectrum that is not harnessed. As a result, the energy conversion efficiency of DSSCs increased to 6.72% without the use of a scattering layer and coadsorbants. We also investigated the effect of aspect ratio of TiO2 particles on photovoltaic characteristic. An increase in the aspect ratio of the synthesized nanomaterials resulted in an increase in carrier lifetime. A decrease in the density of grain boundaries suppresses the trapping of carriers and the subsequent recombination of electron-hole pairs. This study demonstrates that the two-step sol-gel-derived nanomaterials provide a way to achieve appreciable efficiency of photoconversion devices. © 2010 American Chemical Society.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Lee, S
Cho, IS
Lee, JH
Kim, DH
Kim, DW
Kim, JY
Shin, H
Lee, JKjul37@pitt.eduJUL370000-0002-7778-7679
Jung, HS
Park, NG
Kim, K
Ko, MJ
Hong, KS
Centers: Other Centers, Institutes, Offices, or Units > Petersen Institute of NanoScience and Engineering
Date: 23 March 2010
Date Type: Publication
Journal or Publication Title: Chemistry of Materials
Volume: 22
Number: 6
Page Range: 1958 - 1965
DOI or Unique Handle: 10.1021/cm902842k
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 0897-4756
Date Deposited: 16 Oct 2014 14:15
Last Modified: 22 Jun 2021 13:56


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