Efficient quantum capacitance enhancement in DSSC by gold nanoparticles plasmonic effect

Athar Ali Shah, Ali Umar Akrajas, Muhamad Mat Salleh

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Charge collection, transport and the recombination, which can be described by a capacitance of the device, in a dye-sensitized solar cell determine the performance of the device. High capacitance renders efficient charge collection, transport and suppressing the recombination in the device. Here, we report the existence of quantum capacitance or electrochemical capacitance like phenomenon effect in the improvement of the performance of the DSSC device in the presence of Au nanoparticles. By comparing the photovoltaic performances of plasmonic DSSC (ITO|TiO2:Au:dye(N719)|Iodolyte|Pt) with normal DSSC (without gold nanoparticles), it is found that the power conversion efficiency is enhanced by 15.23%, namely from 4.07 to 4.69%, when the Au nanoparticles presence in the device. Electrochemical impedance and optical absorption and X-ray photoelectron spectroscopy analysis suggested that the improvement of the device performance is related to the enhancement of the optical activity of the TiO2 nanostructure via plasmonic effect and defect or oxygen vacancy density modification and the enhancement of carrier transport due to existence of the quantum capacitance effect in the device. The mechanism of the performance enhancement will be discussed in detail.

Original languageEnglish
Pages (from-to)134-142
Number of pages9
JournalElectrochimica Acta
Volume195
DOIs
Publication statusPublished - 20 Mar 2016

Fingerprint

Gold
Capacitance
Nanoparticles
Carrier transport
Oxygen vacancies
Light absorption
Conversion efficiency
Nanostructures
Coloring Agents
X ray photoelectron spectroscopy
Dyes
Defects

Keywords

  • charge transportation
  • electron-hole recombination
  • Gold nanoparticles
  • Plasmonic effect
  • quantum capacitance

ASJC Scopus subject areas

  • Electrochemistry
  • Chemical Engineering(all)

Cite this

Efficient quantum capacitance enhancement in DSSC by gold nanoparticles plasmonic effect. / Shah, Athar Ali; Akrajas, Ali Umar; Mat Salleh, Muhamad.

In: Electrochimica Acta, Vol. 195, 20.03.2016, p. 134-142.

Research output: Contribution to journalArticle

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