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Author: search.filters.author.Maiaugree, WasanSubject: search.filters.subject.Dye-sensitized solar cell

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    Chemically deposited polypyrrole-nanoparticle counter electrode for inorganic I -/I 3 - and organic T -/T 2 dye-sensitized solar cells
    (2012-12-01)
    Towannang, Madsakorn
    ;
    Pimanpang, Samuk
    ;
    Thiangkaew, Anongnad
    ;
    Rutphonsan, Phikun
    ;
    Maiaugree, Wasan
    Pure polypyrrole (PPy) and composited PPy-nanoparticles (multiwall carbon nanotubes (MWCNTs), nickel (Ni) or, titanium dioxide (TiO <inf>2</inf>)) films were coated on conductive glass by a chemical deposition method. They were used as dye-sensitized solar cell counter electrodes. The performance of pure PPy based dye-sensitized solar cells (DSSCs) was ∼6.00% and ∼2.81% for I <sup>-</sup>/I <inf>3</inf> <sup>-</sup> and T <sup>-</sup>/T <inf>2</inf> electrolytes, respectively. The efficiencies increased after MWCNTs and Ni nanoparticle incorporation for both electrolytes, but decreased with TiO <inf>2</inf> addition. PPy-MWCNTs DSSCs delivered the highest efficiency; ∼7.20% and ∼3.19% for I <sup>-</sup>/I <inf>3</inf> <sup>-</sup> and T <sup>-</sup>/T <inf>2</inf> electrolytes, respectively. The improvement of the energy conversion efficiency after MWCNTs and Ni incorporation is attributed to an increase in the electrode surface area and/or a reduction of charge-transfer resistance at the electrolyte/counter electrode interface. © 2012 Elsevier B.V.
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    Optimization of TiO 2 nanoparticle mixed PEDOT-PSS counter electrodes for high efficiency dye sensitized solar cell
    (2012-09-01)
    Maiaugree, Wasan
    ;
    Pimanpang, Samuk
    ;
    Towannang, Madsakorn
    ;
    Saekow, Saman
    ;
    Jarernboon, Wirat
    Poly(3,4-Ethylendioxythiophene)-Poly(Styrene Sulfonate) (PEDOT-PSS) mixed with titanium dioxide (TiO <inf>2</inf>) nanoparticles was coated on conductive glass substrate by a doctor blading method and used as dye-sensitized solar cell (DSSC) counter electrodes. The energy conversion efficiency is significantly improved after TiO <inf>2</inf> nanoparticle incorporation. This improvement is attributed to an increase in counter electrode catalytic activity and a decrease in counter electrode charge transfer resistance. These phenomena were observed using Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS), respectively. The efficiency of polymer-TiO <inf>2</inf> based DSSCs varied with the ratio of small (∼ 25 nm) to large (∼ 100 nm) TiO <inf>2</inf> nanoparticles. The highest efficiency (∼ 8.49%) was obtained with a ratio of 30% large to 70% small (wt/wt) nanoparticles inTiO <inf>2</inf> electrodes. This efficiency is superior to that of Pt DSSC (∼ 7.50%). © 2011 Elsevier B.V.
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    Influences of magnesium particles incorporated on electrophoretically multiwall carbon nanotube film on dye-sensitized solar cell performance
    (2009-10-01)
    Pimanpang, Samuk
    ;
    Maiaugree, Wasan
    ;
    Jarernboon, Wirat
    ;
    Maensiri, Santi
    ;
    Amornkitbamrung, Vittaya
    Multiwall carbon nanotube (MWCNT) films are prepared on a conductive substrate by electrophoretic deposition. The thickness of MWCNT films is found to increase with the carbon nanotube concentration and the deposition duration. Scanning electron microscopy and energy dispersive X-ray measurements detect magnesium particles incorporated on the MWCNT films. The performance of dye-sensitized solar cell using the electrophoretically MWCNT films as a counter electrode shows a relationship dependent on the film thickness and the amount of magnesium loading. The increase in the magnesium loading on carbon films diminishes the solar cell efficiency. This is because magnesium particles cover the carbon nanotube surface reducing the nanotube catalytic sites and blocking electron transfer to tri-iodide (I<inf>3</inf><sup>-</sup>) ions. © 2009 Elsevier B.V. All rights reserved.