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Random Nanowires of Nickel Doped TiO2 With High Surface Area and Electron Mobility for High Efficiency Dye-Sensitized Solar Cells

Rajan, Jose and M. M., Yusoff and Archana, P. S. and Kumar, E. Naveen and Vijila, C. and Ramakrishna, S. (2013) Random Nanowires of Nickel Doped TiO2 With High Surface Area and Electron Mobility for High Efficiency Dye-Sensitized Solar Cells. Dalton Transactions, 42. pp. 1024-1032. ISSN 1477-9226 (print); 1477-9234 (online)

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Abstract

Mesoporous TiO(2) with a large specific surface area (~150 m(2) g(-1)) is the most successful material in dye-sensitized solar cells so far; however, its inferior charge mobility is a major efficiency limiter. This paper demonstrates that random nanowires of Ni-doped TiO(2) (Ni:TiO(2)) have a dramatic influence on the particulate and charge transport properties. Nanowires (dia ~60 nm) of Ni:TiO(2) with a specific surface area of ~80 m(2) g(-1) were developed by an electrospinning technique. The band gap of the Ni:TiO(2) shifted to the visible region upon doping of 5 at% Ni atoms. The Mott-Schottky analysis shows that the flat band potential of Ni:TiO(2) shifts to a more negative value than the undoped samples. The electrochemical impedance spectroscopic measurements showed that the Ni:TiO(2) offer lower charge transport resistance, higher charge recombination resistance, and enhanced electron lifetime compared to the undoped samples. The dye-sensitized solar cells fabricated using the Ni:TiO(2) nanowires showed an enhanced photoconversion efficiency and short-circuit current density compared to the undoped analogue. The transient photocurrent measurements showed that the Ni:TiO(2) has improved charge mobility compared with TiO(2) and is several orders of magnitude higher compared to the P25 particles.

Item Type: Article
Additional Information: IF: 3.806
Subjects: Q Science > QD Chemistry
Faculty/Division: Faculty of Industrial Sciences And Technology
Depositing User: Prof. Dr. Mashitah Mohd Yusoff
Date Deposited: 05 Jun 2014 04:31
Last Modified: 22 Jan 2018 01:15
URI: http://umpir.ump.edu.my/id/eprint/4703
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