Solution-processed Ga-doped ZnO nanorod arrays as electron acceptors in organic solar cells

Riski Titian Ginting, Chi Chin Yap, Muhammad Yahaya, Muhamad Mat Salleh

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

This paper reports the utilization of ZnO nanorod arrays (NRAs) doped with various concentrations of Ga (0, 0.5, 1, 2, and 3 at %) as electron acceptors in organic solar cells. The donor, poly(3-hexylthiophene) (P3HT), was spin coated onto Ga-doped ZnO NRAs that were grown on fluorine-doped tin oxide (FTO) substrates, followed by the deposition of a Ag electrode by a magnetron sputtering method. Adjusting the Ga precursor concentration allowed for the control of the structural and optical properties of ZnO NRAs. The short circuit current density increased with increasing Ga concentration from 0 to 1 at %, mainly because of improved exciton dissociation and increased charge extraction. Meanwhile, the reduced charge recombination and lower hole leakage current led to an increase in the open circuit voltage with Ga concentrations up to 1 at %. The device with the optimum Ga concentration of 1 at % exhibited power conversion efficiency nearly three times higher compared to the device without Ga doping. This finding suggests that the incorporation of Ga can be a simple and effective approach to improve the photovoltaic performance of organic solar cells.

Original languageEnglish
Pages (from-to)5308-5318
Number of pages11
JournalACS Applied Materials and Interfaces
Volume6
Issue number7
DOIs
Publication statusPublished - 9 Apr 2014

Fingerprint

Nanorods
Electrons
Fluorine
Open circuit voltage
Tin oxides
Excitons
Leakage currents
Short circuit currents
Magnetron sputtering
Conversion efficiency
Structural properties
Current density
Optical properties
Doping (additives)
Electrodes
Substrates
Organic solar cells

Keywords

  • charge recombination
  • doping
  • electron acceptor
  • exciton dissociation
  • organic solar cells
  • ZnO nanorod arrays

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Solution-processed Ga-doped ZnO nanorod arrays as electron acceptors in organic solar cells. / Ginting, Riski Titian; Yap, Chi Chin; Yahaya, Muhammad; Mat Salleh, Muhamad.

In: ACS Applied Materials and Interfaces, Vol. 6, No. 7, 09.04.2014, p. 5308-5318.

Research output: Contribution to journalArticle

Ginting, Riski Titian ; Yap, Chi Chin ; Yahaya, Muhammad ; Mat Salleh, Muhamad. / Solution-processed Ga-doped ZnO nanorod arrays as electron acceptors in organic solar cells. In: ACS Applied Materials and Interfaces. 2014 ; Vol. 6, No. 7. pp. 5308-5318.
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