The locus of free charge-carrier generation in solution-cast Zn 1-xMgxO/poly(3-hexylthiophene) bilayers for photovoltaic applications

Jorge Piris, Nikos Kopidakis, Dana C. Olson, Sean E. Shaheen, David S. Ginley, Gary Rumbles

Research output: Contribution to journalArticle

66 Citations (Scopus)

Abstract

The photoconductivity of solution-cast Zn1-xMgxO (x=0-0.4) and poly(3-hexylthiophene) (P3HT) thin films, and Zn 1-xMgxO/ P3HT bilayers is investigated using Time-Resolved Microwave Conductivity (TRMC) with the aim of determining the locus of free charge carrier generation in the bilayer system. The photoconductivity of Zn1-xMgxO thin films, under illumination with 300 nm laser pulses, is limited by the formation of stable excitons and by scattering of the carriers at grain boundaries. The electron mobility in Zn1-xMg xO films decreases exponentially with Mg concentration, up to x=0.4. In agreement with previous work, free carriers are observed in the P3HT film under illumination with 500 nm pulses in the absence of an acceptor. Under illumination with 500 nm pulses, where only the polymer absorbs, the TRMC signal for the Zn1-xMgxO/P3HT bilayers for x≥0.2 is the same as that of pure P3HT, indicating that free carrier generation in these bilayers occurs predominately by exciton dissociation in the polymer bulk, and not at the interface between the polymer and the solution-cast oxide. At lower Mg concentrations (x

Original languageEnglish
Pages (from-to)3849-3857
Number of pages9
JournalAdvanced Functional Materials
Volume17
Issue number18
DOIs
Publication statusPublished - Dec 17 2007

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loci
Charge carriers
casts
charge carriers
Lighting
illumination
Photoconductivity
Excitons
photoconductivity
polymers
Polymers
pulses
Microwaves
excitons
microwaves
Thin films
conductivity
Electron mobility
thin films
electron mobility

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Condensed Matter Physics
  • Physics and Astronomy (miscellaneous)

Cite this

The locus of free charge-carrier generation in solution-cast Zn 1-xMgxO/poly(3-hexylthiophene) bilayers for photovoltaic applications. / Piris, Jorge; Kopidakis, Nikos; Olson, Dana C.; Shaheen, Sean E.; Ginley, David S.; Rumbles, Gary.

In: Advanced Functional Materials, Vol. 17, No. 18, 17.12.2007, p. 3849-3857.

Research output: Contribution to journalArticle

Piris, Jorge ; Kopidakis, Nikos ; Olson, Dana C. ; Shaheen, Sean E. ; Ginley, David S. ; Rumbles, Gary. / The locus of free charge-carrier generation in solution-cast Zn 1-xMgxO/poly(3-hexylthiophene) bilayers for photovoltaic applications. In: Advanced Functional Materials. 2007 ; Vol. 17, No. 18. pp. 3849-3857.
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