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 language | English |
|---|---|
| Pages (from-to) | 3849-3857 |
| Number of pages | 9 |
| Journal | Advanced Functional Materials |
| Volume | 17 |
| Issue number | 18 |
| DOIs | |
| Publication status | Published - Dec 17 2007 |
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ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Materials Science(all)
- Condensed Matter Physics
- Physics and Astronomy (miscellaneous)
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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 journal › Article
}
TY - JOUR
T1 - The locus of free charge-carrier generation in solution-cast Zn 1-xMgxO/poly(3-hexylthiophene) bilayers for photovoltaic applications
AU - Piris, Jorge
AU - Kopidakis, Nikos
AU - Olson, Dana C.
AU - Shaheen, Sean E.
AU - Ginley, David S.
AU - Rumbles, Gary
PY - 2007/12/17
Y1 - 2007/12/17
N2 - 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
AB - 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
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U2 - 10.1002/adfm.200700305
DO - 10.1002/adfm.200700305
M3 - Article
VL - 17
SP - 3849
EP - 3857
JO - Advanced Functional Materials
JF - Advanced Functional Materials
SN - 1616-301X
IS - 18
ER -